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3" catco to 3" S pipe to 2.5" catback. is going directly from a 3" s pipe to a 2.5" i pipe going to restrict? Please dont tell me to get a 3" system I already have a 2.5" flowmaster, just i need opinions on what to do before the catback. (what would be the best size converter and s pipe to use with my 2.5" catback?)
[ May 04, 2003: Message edited by: SlimJim1284 ]</p>
Well, I think you're looking at a "bigger is better" situation here. The 2.5" I-pipe is going to restrict, but I think the 3" cat and s-pipe would be an improvement.
2005 Cavalier LS Sport M5<br /> <a href=\"http://members.cardomain.com/firefighter8615\" target=\"_blank\">http://members.cardomain.com/firefighter8615</a>
I would probably think the 3" is the best.
However, b/c you have a 2.5" i-pipe, it'll probably cause a bottle neck there. It's best to run 3" piping all the way back. You could always do the 3" cat and 3" s-pipe and upgrade the i-pipe and muffler later.
In my personal honest opinion I don't think there is a HUGE difference between 3in and 2.5in pipe. This bottlenecking thing everyone talks about I don't think will happen. Stock people go from a 3in ypipe into a cat and downto a 2.25in pipe. Wouldn't that bottle neck? I think even if the laws of science and someone proved that it did, would you really even notice it? 2.5in is still a pretty good flowing exhaust. I'm going with a 2.5in exhaust system. I think the gains I will see from a 3inch over 2.5 inch won't be that drastic. Plus i'll have headers. But I don't think i'd worry about it SlimJim, but that's just me.
<blockquote>quote:</font><hr>Originally posted by Ted: In my personal honest opinion I don't think there is a HUGE difference between 3in and 2.5in pipe. This bottlenecking thing everyone talks about I don't think will happen. Stock people go from a 3in ypipe into a cat and downto a 2.25in pipe. <hr></blockquote>
I have to disagree based on experience and dyno proof. ;) When I first dyno'd at Hypertech, I pulled 189.9 RWHP and 223.0 RWTQ with the mods below except I was running stock cat & stock s-pipe into the 3" Borla I-pipe. I added the 3" cat & 3" s-pipe, dynoed again at Hypertech, and gained 7.8 RWHP and 4 RWTQ.
<blockquote>quote:</font><hr>Originally posted by SlimJim1284:
no, none of those bastards give it to you. BTW anybody got an inteligent answer to this question?<hr></blockquote>
the reason they don't offer the S bend, is for this simple reason:
the S bend is PART OF the GM stock catalytic converter setup!
when i had mine replaced (under emissions warranty), I got a NEW Y pipe, collector, cat, and S pipe. for this reason, it is still called a Cat back exhaust.
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