After a few threads that i have read on this "header subject" i have wondered if i made the right decision on a header. here is the reason i state this.
in order to improve power gains it is better to have a larger collector outlet in both the exhaust manifold and the piping thereafter. after a lengthy debate with othe ti memebers we came to the conclusion that the comptech header has a 2.14 inch collector on it and the rsr has a 2 3/8" collector, which is pretty rare. but after looking at both the headers i noticed that the comptech has a much better(smoother tube design) and the rsr has some pretty steeply arc'd tube design. i wish i could host pictures of the two so i could provide a better idea as to what they look like. but here is my question:

If you have a 2.14 collector and you use a 2.25 high flow with a 2.14 outlet on on side and a 2 3/8 because that is the dimension of the exhaust i currently have on my car.
OR
If you have a 2 3/8 inch collector on the header leading intoa 2.5 inch high flow with a 2 3/8 outlet welded on each side with the same exhaust sized tubing.

which will prove better gains in the long run

scenario one?
or
scenario two?

folks please don't tell me to go 2.5 " it isn't a factor that i will consider.




[Modified by au-gsr, 11:07 PM 1/2/2003]

 

Header design is more important than that 1/8" you are stuck on.

 

anyone else?

 

The length of tubing right at the exhaust ports and their radius is important. A longer primary before the bend is good to have; and of course a smooth bend is good.

I have good faith in Comptech products, so you can't go wrong.

 

I have a rsr header it's nice, but the welds inside were kind of nasty so I ported and polished it. BTW Peter Yem ran a 11.xx all-motor with a rsr header this was back in 97.