Hey guys, I was looking into getting headers and an exhaust system for my Firebird and its going to remain an l03 for a while as its my DD so i gotta keep some gas mileage.
Anyhow I'm gonna be putting exhaust and a dual CAI on it and i was wondering what size exhaust I should put on. I was thinking hooker headers (not sure what kind yet, aerochambers or darksides) but past that i was thinking Y pipe and maybe 2 and a half inch pipes from the Y back (no cats)

I was wondering if that would be too little back pressure and i'd start burning oil, Also was wondering a general HP/MPG increase/decrease that someone has done or can hypothesize about.

 

Well if you have emissions testing that requires a visual inspection you'll need HOOKER 2055 headers and y pipe. If you plan on upgrading eventually i'd just run a 3 inch exhaust now, but you could get by with a 2.5 no problem. I'd say a full exhaust upgrade with a header install and your an easy 25 HP+

And, I saw a pair of hooker darkside headers for sale in the for sale section on this site. If you dont have emissions testing then you can use them. But I dont know how the fitment is. But you can always ask in the Exhaust section of this site and im sure someone will be able to answer your question

 

I see what your saying, i don't require emissions testing so i was leaning towards darksides, With the dual 4" CAI would that bump it up about 35 40 HP you think? Thanks for the quick reply!

 

well im sure you'll deffinately gain something. The stock air cleaner is so restrictive on these cars. You dont really need a dual 4 inch setup unless that is what you want...a single 4 inch would be enough to feed it.

 

The reason I was gonna get a dual 4" is that its for some ridiculous reason its cheaper than a single.... Don't know why but thats what oreillys said lol.
A dual to me looks cooler and the way i see it you can't have your car breath TOO much right?

 

cant breathe too much...correct..the engine will only pull in so much though. But thier is no such thing as ram air anyway

 

Assuming sarcasm there... lol
Would a Ram air be better than a dual CAI?

 

No sarcasm. No ram air. Your setup is okay

 

No such thing as ram? I don't quite get it... thought there was lol. So overall thats a good setup and i should see some decent HP increase. Any thoughts on mpg increase cuz its my DD..

 

I did hooker 2055s, 3" catco cat, 3" dynomax. What a difference. Like uncorking it. I'm not so sure how duals would be cheaper since you will need custom work done for that. With a single 3" all the parts will just bolt together.

 

Mileage should increase if stay out of the pedal. More efficient, more torque with less pedal.

 

A 4" dual plenum (carb hat) for a cold air intake is cheaper, I have no idea why but thats what oreillys has lol
Sorry for the misunderstanding

 

id run a y pipe into a single exhaust and if you want to split it over the rear end for the dual look then do that IMO