Long-tube header bottleneck?

[Driv3n to Dr1ve]

Earlier this month I had inch and 7/8ths kooks catted LTH installed. Unfortunately I could only source the OEM connection version, so the headers go to 2.25” then back to my 3” catback. There are 3” connection pipes I could buy, but N/A am I really loosing any flow or power? The car is pretty basic, tuned with a gt350 manifold and on pump 92.

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[K4fxd]

It's a real bottle neck @engineermike did pressure testing. Search for his thread.

 

[Driv3n to Dr1ve]

It's a real bottle neck @engineermike did pressure testing. Search for his thread.

Good to know, i see that the kooks pipes are slip-joint style. Would they slip onto a corsa X-pipe? Just want to be sure that I order the correct clamp style.

 

[WildHorse]

Would they slip onto a corsa X-pipe?

i wanna say no. Seems parts manufactures nowadays go out of there way to make sure incompatibility is alive and well.

 

[Driv3n to Dr1ve]

i wanna say no. Seems parts manufactures nowadays go out of there way to make sure incompatibility is alive and well.

Have you tried this?

 

[WildHorse]

Have you tried this?

Nope. But I'm still betting no.

 

[K4fxd]

Would they slip onto a corsa X-pipe? Just want to be sure that I order the correct clamp style.

I would cut out the 2 1/4 section and fab up a 3 inch connection. If you don't have welders ect I would take it to an exhaust shop.

3 inch butt clamps would probably work if you don't want to weld.

Something like this.
https://www.amazon.com/Exhaust-Conn...ords=3+inch+butt+clamps&qid=1679529837&sr=8-9

 

[Prodigal]

NA small cube engine no way it needs dual 3”. Large cube big blocks maybe, but not a 302.

 

[Driv3n to Dr1ve]

I would cut out the 2 1/4 section and fab up a 3 inch connection. If you don't have welders ect I would take it to an exhaust shop.

3 inch butt clamps would probably work if you don't want to weld.

Something like this.
https://www.amazon.com/Exhaust-Conn...ords=3+inch+butt+clamps&qid=1679529837&sr=8-9

Nice okay. For context, the kooks 3 inch pipe I’m looking at would actually slip onto the header end without needing to cut, the reducer portion was a slip-on. Same with the corsa system
Basically, no part of the 2.25 inch pipe is permanently on which limits fab work required. I will need a butt clamp for sure. Not going to weld it since kooks+ corsa is very loud, and I’d like the option to swap catback/resonator components at will.

 

[Driv3n to Dr1ve]

NA small cube engine no way it needs dual 3”. Large cube big blocks maybe, but not a 302.

Yeah, this basic N/A setup is only making 450 whp. It survived a 6 hour track day so I think it’s fine.

 

[Jimmy Dean]

NA small cube engine no way it needs dual 3”. Large cube big blocks maybe, but not a 302.

you have to consider the RPMs as well, and resonance effects. a 302 turing 7500 is the same as a 460 turning 5k. requires a lot of exhaust area.

 

[AZ18yote]

Good to know, i see that the kooks pipes are slip-joint style. Would they slip onto a corsa X-pipe? Just want to be sure that I order the correct clamp style.

ARH made a direct connect from theirs to Corsa double X but not sure if Kooks has the same offering.

 

[18psi]

It's a real bottle neck @engineermike did pressure testing. Search for his thread.

That was at 650-750+. IMO definitely not on a bolt on n/a coyote.

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