I but a new 3in catback on ebay and the piping that bolts to the cat is 2.25 and goes up to about 2.75-3.0 in at the end by the muffler. Is this how must so called 3in catbacks are or is all the piping suppost to be 3in? If im running 15psi with this exhaust and stock downpipe and cat how much horspower will I be missing out on?
#91831, "RE: 3in exhuast questions" In response to Reply # 0
That's a bullshit cat-back right there. If it's 3 inches then it should be 3 inches all the way through. Don't go cheap especially when you got a turbo if you want 100% effectivity.
1995 Eagle Talon Esi 14.4 @ 102MPH Speedworld Motorplex Phoenix, Arizona
#91847, "RE: 3in exhuast questions" In response to Reply # 2
Originally posted by taloniized That's a bullshit cat-back right there. If it's 3 inches then it should be 3 inches all the way through. Don't go cheap especially when you got a turbo if you want 100% effectivity.
uh I have a $700 Tanabe catback exhaust and its 3" downpipe and has a 2.5" flange.
The reason manufacturer's put 2.5" flanges on the pipe is so it can be used with the stock cats as well.
#91842, "RE: 3in exhuast questions" In response to Reply # 0
Originally posted by eclipseman1999 the piping that bolts to the cat is...
Dunno where you live, but if no emmission testing... why not just elimate cat all together and go 3" all the way? Or get a testpipe & replace whenever going in for testing.
#91850, "RE: 3in exhuast questions" In response to Reply # 7 Dec-06-05 02:14 AM by Aggression
Originally posted by J
Originally posted by eclipseman1999 the piping that bolts to the cat is...
Dunno where you live, but if no emmission testing... why not just elimate cat all together and go 3" all the way? Or get a testpipe & replace whenever going in for testing. Much simpler if able, - J
Thats what I did, just went with a 3" test pipe. My downpipe is 2.5, but will soon be 3" as well. Then I will have a 3" turbo back system.
But yah, don't go cheap on the exhaust system like talonized mentioned above. I recommend the Apex'i N1 3" catback for the GS-T's. That is what I use and I love it. Also has a nice deep tone to it.
#91857, "RE: 3in exhuast questions" In response to Reply # 8
I've got a 2.5" downpipe (Thanks Matt!), a 2.5" high-flow cat, and a 3" ERT catback (prototype unit). Everything pretty much bolted up without any problems! And having a 2.25" flange is NOT high quality.
96 Indy Red Dodge Avenger I4 5spd 225.7whp/227.2wtq @ 10psi, currently running 12-14psi. HRC Stage III turbo setup JE 8.8:1 pistons Eagle rods block bored .020" over GReddy FMIC w/ custom piping 1G crushed BOV SPEC Stage 3 clutch 2.5" DP, 2.5" high flow cat, 3" ERT catback w/ Magnaflow muffler and 3" tip. much much more...
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