Long Tubes or Mid-lengths

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Aug 18, 2025 | 07:48 AM

#21

C7rocket

2nd Gear

Joined: Aug 2025

Posts: 2

Likes: 2

Quote:

Originally Posted by ImpliedConsent

Engine Masters did a video years back, comparing exhaust manifold v. shorties v. long tube headers. Long tube headers made the most power. They were not connected to cats or x-pipe, just straight. I'm not sure how much loss there is on catted x-pipe, but it couldn't be much. With no cats, you'll get gas smell (trust me, this is my current setup). I don't have emissions testing, so not sure how to answer.

https://youtu.be/O1bXPNy1Yn4

i just had Texas speed performance long tube headers with cats installed on my 2017 c7. And according to the tech at tsp there is only a 3 hp difference between headers with cats and no cats(+3hp)

Aug 18, 2025 | 10:56 AM

#22

Dcasole

Le Mans Master

Joined: Oct 2014

Posts: 8,673

Likes: 2,728

From: Atlanta GA

Quote:

Originally Posted by C7rocket

according to the tech at tsp there is only a 3 hp difference between headers with cats and no cats(+3hp)

I agree , for the couple HP that you lose its not worth smelling like you just cut the grass with a 2 stroke weed wacker ....

I have high flow cats and only have some gas smell on cold start up , after they get hot there is no smell at all

Dave

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