My next thing is to do the exhaust system for my 2004 Civic Si. I plan to do it all from headers back. I am looking for a good 4-1 header and am having trouble. Can you help me?

 

Your cat is the issue.

 

Well the good news is you'll only need one HEADER not two.

 

depends on how much you want to spend.

see what www.comptechusa.com has to offer

 

Ill spend whatever it takes to get the most horsepower for my $$$.The cat is getting changed to a high flow one too. I checked comptech, they have a nice 4-2-1 stainless steel, but i really wanted a 4-1 so that i can gain the horsepwer in the high end. what u think?

 

since your post makes it seem like you shit out money dtr-fab and hytech make some killer k series headers. how much power are you looking to make?

 

I'm looking to get a pretty good amount from doing the entire exhaust. i dunno exaclty what i am looking for though. Sorry if i made it sound as if i was broke as hell.

 

with a good header and some tuning you can maybe see an extra 10-15 whp. another 2-5hp with an exhaust.

if you really want to make power swap in a k20a/2

 

If i wanted to spend that kind of money i would... well thats sounds like some nice gains. It still comes down the header to put on. I looked at DC Sports, the have a gppd 4-2-1. Comptech has a good 4-2. I looked at hytech and got a little confussed on the pricing...

 

yea hytech is gonna be pricey. they always are.

dont forget something to tune with. hondata for example. do you plan to upgrade the internals as well?