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10 Best Flowing Chevy Exhaust Manifolds of 2021 [Review & Buyer’s Guide]

This guide will look at some of the best flowing Chevy exhaust manifolds you can invest in.

The exhaust manifold works as the collection point for exhaust gases that are released from the engine cylinders.

Once the exhaust gases are collected, they are concentrated in a specific place to ensure easy passage through the other part of the engine system.

You don’t have to wait until your exhaust system is inadequate or faulty before you seek a replacement.

You can opt for an upgrade even if your exhaust is working well.

When you replace the factory’s exhaust manifold with a new one, this brings a reduction in the engine temperature, lowers backpressure, and overall increases your truck’s performance.

The top flowing Chevy exhaust manifold brands on the market are DORMAN, TUNERBITS, PACESETTER, SPEEDWAY MOTORS, APDTY, AJP DISTRIBUTORS, DNA MOTORING, and ALLSTAR.

These brands were selected based on essential factors such as quality, backpressure, performance, price, and customer reviews.

The Comparison Table of Best Flowing Chevy Exhaust Manifolds Updated!

PreviewModelPrice
Dorman 674-940
TUNERBITS
Pace Setter 70-1320
Speedway Motors
Dorman 674-525
APDTY 785814
Dorman 674-561
AJP Distributors
DNA Motoring HDC-SBC-SB
Allstar Performance ALL34200

What is the best flowing Chevy exhaust manifolds?

The best flowing Chevy exhaust manifolds must fit your vehicle perfectly.

Not only that, they must be made from top-quality material to ensure reliable performance and must come with the necessary hardware to achieve the total repair.

Overall, these manifolds must be a design a lot of other vehicle owners can trust.

From our research, we keep faith in Auto Dynasty as the best flowing chevy exhaust manifolds.

Why DORMAN is the best brand for flowing Chevy exhaust manifolds?

Aside from being affordable, this brand is built for strength and improves your vehicle’s engine’s performance.

Since it is made from top-quality steel, it is not susceptible to rust, which ensures it serves you for a very long time.

The finish of the complete system is smooth, which gives it a touch of a premium brand.

When installed, you will love and appreciate how great it looks on your vehicle, especially the absence of stains or dents.

Overall, you are guaranteed an amazing airflow, and the kit also comes with Metal Gaskets and Reducer.

Top 10 Best Flowing Chevy Exhaust Manifolds Review And Buying Guide

01. Dorman 674-940 Exhaust Manifold: Built for long-lasting performance

 

Highlighted Features

  • Made from top-quality materials (Stainless steel)
  • 3 pounds in product weight
  • Manifold and Flange gaskets (1 each)
  • Nuts and bolts (3 each)
  • 14 x 12.6 x 6.9 inches in dimension

This is a design every vehicle owner can trust, one of the Best Flowing Chevy Exhaust Manifolds in the current market.

Dorman is a popular brand, and it is one of the top designs in the market. So, credibility and equity are unquestionable.

If you have been looking for a perfect exhaust manifold replacement for your vehicle – A product that guarantees performance, quality, durability, and perfect fit, here is an excellent choice for you.

Dorman 674-940 Exhaust Manifold is made from top-quality metal; this eradicates warping, restrict leaking and cracking.

All of these features contribute to ensuring you experience continuing excellent performance.

Dorman 674-940 is excellently packaged.

The package contains all the necessary hardware you need for Installation – there are the gaskets (Manifold and Flange), the heat shield screw, and bolts and nuts.

In case you desire to paint the exterior, you can easily do that without any hesitation or limitation.

Although Dorman 674-940 is a perfect fit for Chevrolet and GMC Models, there are some notable downsides reported by users of this design.

For instance, the absence of 10 self-locking nuts and the bolts needed to attach it to the catalytic converter.

Users of this exhaust may have to re-use the bolts from the original or factory exhaust manifolds since they are hard to find.

Also, Installation may be complicated, especially if you haven’t done an exhaust manifold installation before.

Pros

  • Not affected by extreme temperature
  • Well-packaged product
  • Durable and long-lasting performance
  • A design you can trust

Cons

  • No bolts to mount the exhaust to the catalytic converter and the engine
  • Installation may be difficult

02. Chevy S10 GMC Sonoma 96-00: Affordable and easy to fix exhaust manifold

 

Highlighted Features

  • Installation is easy (direct bolt-on)
  • Top-quality stainless steel (well-polished)
  • Excellent welding
  • 15 pounds in weight
  • 18 x 14 x 7 inches dimension

This exhaust manifold has a pleasing appearance, thanks to its well-polished stainless steel finish.

If you are a vehicle owner who gives a top consideration for great appeal, this design is highly recommended.

Chevy S10 GMC Sonoma 96-00 is designed for anyone who plans to restore their Chevy’s appearance, especially if you desire a shiny exhaust manifold over performance.

The installation process is not complex; anybody can carry out the mounting without an expert’s help.

Well, in case you are confronted with any difficulties while mounting this exhaust on your vehicle, do not hesitate to reach out to a professional.

Although Chevy S10 GMC Sonoma 96-00 may not excessively improve or enhance the engine performance, this manifold is one of the top choices on our list when it comes to appearance.

Suppose your major interest in an exhaust manifold is additional Horsepower and torque. In that case, this may not be the ideal choice for you.

Pros

  • Great looking headers
  • Amazing set for the price
  • Top-quality design and a good fit
  • The appearance is top-class

Cons

  • May not excessively improve engine performance

03. Pace Setter 70-1320: Best for exact fit replacement

 

 Highlighted Features

  • Comes with necessary bolts and studs
  • Sold and packaged as a pair
  • 3/8 inches Flange thickness
  • Made from top-quality steel
  • 16-gauge carbon steel

When installed on your vehicle, Pace Setter 70-1320 brings about a performance improvement.

The flanges’ thickness is impressive, which ensures leaks are eradicated.

This design is easy to install, fits perfectly on your vehicle, improves performance, and the overall quality is impressive.

If you are buying Pace Setter 70-1320, you have two choices or options to pick from- the PaceSetter’s exclusive ARMORCoat (ceramic coated) and the standard black painted finish.

This exhaust manifold comes with the necessary hardware you need for Installation- There are gaskets, bolts, and an installation manual is also included in the package.

While mounting this exhaust manifold, make sure you take necessary precautions- avoid extreme tightening of the collector flanges to avoid damaging them (bending).

Also, the header finish is coated with paint that can’t withstand high temperatures- it will burn off with time.

So, you may need to buy a paint that can withstand high heat and recoat accordingly.

Pros

  • Very durable design
  • Installation is not complex
  • Guarantees unbeatable engine performance

Cons

  • Downpipe flange may bend when excessively tightened
  • The coating is not heat resistant

04. Smoothie Rams Horn Exhaust Manifolds: A perfect design for your vehicle and no problems with fitting

 

Highlighted Features

  • Comes in Chrome finish
  • Compatible with angle or straight plug heads
  • 19 x 9 x 8 inches in dimension
  • Made from top-quality steel
  • Sold in pair
  • Gaskets and all the necessary hardware are included
  • 22 pounds in weight

This is another classic design on our list for the Best Flowing Chevy Exhaust Manifolds.

Smoothie Rams Horn Exhaust Manifolds are excellent for application with small block Chevy (Fit perfect on small block 350).

When installed, these manifolds ensure excellent clearance for angle/straight plug heads.

When delivered, the package comes with the necessary gaskets and other installation hardware you need.

The appearance is excellent, and you will be fascinated with how pleasing the exhaust looks- Great fit and finish.

Before you purchase Smoothie Rams Horn Exhaust Manifolds, make sure you check for compatibility.

For instance, the 1962 Chevy Impala users reported that these exhaust manifolds didn’t fit their vehicle.

Overall, once it’s compatible with your vehicle, these manifolds fit the engine perfectly and ensure you get all you need.

Pros

  • Fit perfect on small block 350
  • Good quality design and appearance
  • Great performance and worth the investment

Cons

  • Not compatible with all Chevys

05. Dorman 674-525: Fits right, well made, and a good replacement you can count on

 

Highlighted Features

  • 5 pounds in weight
  • Dimension: 23.88 x 9.63 x 6.63 inches
  • Comes with necessary components and hardware
  • Top-quality gaskets
  • Eradicates leaks, warps, and cracks

This is the second Dorman design on our list. This shows what a great brand Dorman is.

Dorman 674-525 is packaged and delivered with every necessary installation hardware and components, just as advertised by the manufacturer.

The gaskets are made of top-quality steel; this reliable construction eradicates cracking, warping, and leaking. In the end, long-lasting and dependable performance is guaranteed.

Before you invest in this design, make sure you check for compatibility. Check the manufacturer’s website to see if it is a perfect fit for your vehicle- Ensure you look at the model and trim level.

During Installation, make sure you are careful while tightening the screw to avoid damaging the screw hole- Avoid hard tightening.

According to many users of this product, Dorman 674-525 is a perfect/complete upgrade to the exhaust manifolds that come from the factory.

Pros

  • Excellent performance
  • Built for strength
  • Pocket-friendly

Cons

  • Screw hole may break when screws are tightened too hard

06. APDTY 785814 Exhaust Manifold

 

Highlighted Features

  • Excellent welds
  • Comes with necessary hardware, and installation manual
  • Heavy-duty cast iron design
  • 2 pounds in weight
  • 19 x 22 x 9 inches in dimension
  • Direct bolt-on installation

When you mount APDTY 785814 Exhaust Manifold on your vehicle, the overall performance is enhanced by efficiently eliminating exhaust gas.

This design is popular not just because of its unbeatable performance but also because of its appearance and pocket-friendly price.

All the above-listed features or factors are major contributions to its widespread adoption, popularity, and trust.

The Installation is easy, which limits or totally eradicates the need for a professional. The package comes with instructions on how you can install and remove the exhaust.

APDTY 785814 is durable, thanks to its top-quality cast iron design. This ensures you can enjoy the optimum performance it offers for a very long time.

Since this exhaust manifold can last for several years, you will save more money on replacement and at the same time enjoy unbeatable engine performance.

Overall, APDTY 785814 is a top exhaust design, affordable, and gives users the best purchase value and experience.

It is also important to check for compatibility before making a purchase decision.

You can easily ascertain this by inserting your vehicle’s year, make, and model in the Amazon garage.

Pros

  • Made from solid materials
  • Installation is easy
  • The gasket is of good quality

Cons

  • Not a one-size-fits-all design

07. Dorman 674-561 Exhaust Manifold: Best aftermarket exhaust for the price

 

Highlighted Features

  • One Flange and Manifold gasket each
  • Made from standard Cast Iron
  • One exhaust manifold in a box
  • 3 bolts and nuts each
  • 08 pounds in weight
  • 5 x 8.6 x 5.6 inches in dimension

Here is an excellent exhaust manifold design for your vehicle if you own/drive a 2013 Chevy Equinox LS 2.4l.

The package contains a brand new gasket, heat shield bolts, and other valuable hardware and components you need for the Installation.

Made from great quality Cast Iron, this offers durability and strength that guide against cracks, leaks, and warps.

The performance (works excellently well just like OEM) and the appearance is fascinating.

Overall, this is a design you will be happy with, and it justifies every penny you invest in it.

Based on the information gathered online- Forums and reviews, Dorman 674-561 Exhaust Manifold have no downsides when it comes to performance.

Just like other brands on this list, it is important to check for compatibility before investing in this product.

Pros

  • Easy install design
  • Great quality material.
  • Improves engine performance
  • Sits on the vehicle perfectly

Cons

  • Doesn’t fit all Chevys

08. Chevy SBC

 

Highlighted Features

  • Excellent finish (Stainless steel)
  • Left and right headers
  • 4 pounds in weight
  • 3/8 inch flanges
  • Excellent welds

Designed by one of the world’s top brands (AJP Distributors), this exhaust manifold offers excellent/top performance.

Also, it comes with an attractive appearance/design, thanks to its top-class stainless steel finish.

When installed on a compatible vehicle, it fits perfectly and excellently well.

Hence, you won’t need to attempt any form of modification.

To add to that, this is an excellent choice for individuals who desire an improvement in Horsepower and engine performance.

Since the package doesn’t come with an installation manual, you may need to consult a professional to conduct the Installation, especially if it is your first time.

Again, ensure you check for compatibility before you make a purchase.

Pros

  • Quality exhaust manifold design
  • Guarantees top engine performance
  • Modification is not required
  • Brings about an excellent reduction in backpressure
  • Enhances the engine’s Horsepower

Cons

  • Doesn’t come with an installation guide
  • You may need to hire a professional for Installation

09. DNA Motoring HDC-SBC-SB Exhaust Manifold

 

Highlighted Features

  • 72 pounds in weight
  • 6 x 14.8 x 6 inches in dimension
  • Comes with gasket and reducer
  • Bolt-on Installation
  • Silver in color

DNA Motoring HDC-SBC-SB Exhaust Manifold is an excellent choice for individuals who drive/own Small Block Chevy V8 Engines the Standard Exhaust Pattern – 283, 305, 327, 350, and 400.

Still, make sure you check for compatibility before you make a final purchase decision.

This design is manufactured to enhance your vehicle’s engine’s performance- By ensuring the engine pushes or gets rid of exhaust gases from the cylinder.

DNA Motoring HDC-SBC-SB Exhaust Manifold is professionally welded and made from top steel material to ensure durability and longevity.

In the pack are the gasket, reducer, and all the necessary hardware components.

The installation process is easy (Bolt-on). So, there won’t be any need for modification during mounting.

Since it doesn’t come with an installation manual, we recommend hiring a professional to carry out the Installation for you, especially if you are replacing the exhaust manifold for the first time.

Pros

  • Top performance is guaranteed
  • Durable and long-lasting
  • Made from top quality materials

Cons

  • Absence of installation guide

10. Allstar Performance ALL34200 Exhaust Manifold

 

Highlighted Features

  • 1 pound in weight
  • 8 x 148.8 x 116.4 inches in dimension
  • Aggressive look
  • 2 manifolds in a pack

Known for its aggressive look, Allstar Performance ALL34200 Exhaust Manifold may not be an ideal choice for individuals who are fascinated by attractive appearance or elegant finishes.

If you are an individual who prioritizes engine performance over appearance, this may be a design for you.

As raw and unattractive as the appearance may be, the improvement this design brings to your vehicle’s engine is non-negotiable.

Also, Allstar Performance ALL34200 Exhaust Manifold is designed to perfectly fit several small block Chevy engines.

This feature makes it a general exhaust replacement option for vehicles that run on such engines.

The only noticeable downside about ALL34200 is the cost of acquiring it.

It is one of the most expensive options on this list, compared to other brands that offer the same output for overall performance.

Pros

  • Enhances exhaust flow and engine performance
  • Fits perfectly on vehicles
  • Installation is not difficult

Cons

  • A bit expensive

Buying Considerations of Choosing The Best Flowing Chevy Exhaust Manifolds

There are some things you need to examine and put into consideration before you finally make a purchase. Below are the top factors you need to look at:

  • Have a budget

This is one major factor you need to consider (know how much you are willing and able to spend).

When you have a budget, it is easier to narrow down your search, thereby ensuring you get an exhaust that falls within your spending power.

Suppose you want to get a top-quality exhaust that guarantees performance and durability.

In that case, you should be willing to spend above the market average price.

In the end, you will save more because you won’t need to constantly replace this vehicle component.

You must also understand that because an exhaust manifold is sold for a high price doesn’t equate to quality.

This is why you need to conduct detailed research before you finally agree on the brand you want to go for.

  • Materials

Exhaust manifolds are commonly made from cast iron, stainless steel, and aluminized steel.

To ensure optimum engine performance and longevity, you must go for a brand built to withstand high temperatures.

Although exhausts made from aluminized steel are pocket-friendly, they are not as tough as stainless and cast iron manifolds.

The price is always attractive and tempting; in the end, you will spend more on replacement than buying a top-quality brand.

It can’t withstand extreme weather conditions.

If you are looking for an exhaust to buy, make sure you go for a brand made from iron cast or stainless steel.

This exhaust does not warp, leak, or crack- they are not affected by extreme heat.

  • Installation

Make sure you check for compatibility before you finally invest in any exhaust manifold brand.

When you get the right exhaust for your vehicle, the installation process becomes easier.

You can also look at some of the best brands that come with an installation guide- this aid easy installation and removal.

For compatibility test, you can make use of the Amazon garage.

All you need is to provide a series of information about your vehicle.

The Make, Model, and Year and you will get a report that tells you if an exhaust brand is a perfect fit for your vehicle or not.

  • Preference

It is important to know what you desire in your choice of an exhaust manifold.

For instance, some brands are designed to enhance your vehicle’s appearance (classy look), thereby contributing a little to performance.

On the other hand, some brands focus exclusively on performance.

Ensure you know exactly what you desire or stand to gain from installing an exhaust on your vehicle.

Common FAQs of Best Flowing Chevy Exhaust Manifolds

  1. What are the signs of a bad exhaust manifold?

When your exhaust manifold is going bad, it may start cracking or leaking.

When cracks and leaks occur, the engine may start making disturbing noises, which affects your vehicle’s performance.

Not only that, some other parts of the vehicle may stop functioning efficiently, especially when exposed to the extreme heat that is released from the cracked exhaust.

  1. What are the best flowing Chevy exhaust brands?

In this guide, we have carefully discussed 10 top brands that you can go for.

These brands improve exhaust flow and enhance overall engine performance.

Read through this guide and choose a compatible brand with your vehicle, which also fits your budget and expectations.

Conclusion

To achieve a performance improvement, you need to install a top-class exhaust manifold on your vehicle.

You don’t need to wait until your exhaust goes bad before you consider a replacement; you can attempt an upgrade by replacing an old exhaust with a new one.

Immediately you notice a drop in airflow and Horsepower; this may be a sign that it is time to consider a replacement.