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if i go 2.5" press bent will i loose a lot of low end tourque? other than a good muffler anyone have any suggestions on how to get the most bang for my buck with a custom cat-back. what do the companies like kore and pacesetter do to increase power with just a new cat-back?


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To help you out. I got a 2 1/4 press bent exhaust and saw no loss of bhp or torque anywhere. ( i saw the dyno graphs ). Otherwise my motor is a stock 2ltr 5 speed Lantra (apart from minor tuning and intake mods).
The only reason i didn't go to a 2 1/2 is the possible noise factor.
On my 2 1/4 i got the most free flowing straight thru mufflers i could buy.
** A Genie Tornado & a Genie Resonator - see the link for the tests http://www.autospeed.com/A_0381/page1.html **
My car is definitley louder than stock, but not too loud and has a deep tone.
Million dollar question:-If i went back in time would i choose the 2 1/4 again?
Yes.
If i wanted every tiny bit of power with no consideration for noise, then i would go for the 2 1/2 exhaust.

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If, by press-bent you mean crush bent, save your money a little longer for mandrel-bent corners. Any shop can buy them (as most don't have a mandrel-bender), and weld them together like a puzzle with straight sections to make you a custom cat-back. If you're already looking at mandrel-bent corners, I'd stick with 2.25", as 2.5 just has too much internal volume to build backpressure, and you'll most likely lose low-end, and might not gain top-end at all. My $.02


<hr width=60% noshade size=1 align=left>2001 Nissan Sentra SE with Perf. pkg, custom 2.25" exhaust, Place Racing CAI, AEM Bypass valve, Intrax springs, ES shifter bushing, short shifter, PIAA's all around, all synth fluids, more to come...
 
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