scottHMT

iTrader: (5)

I have a 2.5 in true dual setup on my car. Its a 00 z28 with LT, intake, H/c (torquer v2). Do you think i'll need 3in true duals? Or should 2.5 inch be enough? Its going through a x pipe to some magnaflow bullets, and then they dump right after that.

mean_greenZ

iTrader: (1)

we will only answer this if you provide a sound clip!












lol jk. your fine with 2.5" no need to waste money for half inch bigger tubing. 2.5" can handle alot.

teke184

iTrader: (5)

my guess would be you might gain a SMALL amount if you are <500rwhp.

so basically...no you don't need 3"

scottHMT

iTrader: (5)

Lol, thanks guys, honestly I think it sounded better open header, but i'd get tickets all day long

teke184

iTrader: (5)

i ran my cammed engine with LTs, 3" xpipe and no mufflers, dumped.

while it sounded good idling, and mean driving....it got old.

i actually enjoyed the car MORE once i put mufflers on it, i wasn't affraid to actually drive it.

limping around a 1200rpm to avoid cops was crappy.

streetassasin

iTrader: (30)

I have 2.5" and it seems to pull a little harder than my borla ORY setup did

jmm98LS1

iTrader: (28)

The general consensus is 2.5" duals start becoming a restriction once you crest ~500fwhp.

JBIRD02

iTrader: (4)

This is what I was always told too. I went w/ 3" so I'd have room to grow later on. Sounds great too!

180ls1

iTrader: (4)

ya which is in thr 430rwhp range i believe, and you need to fix your exhaust sound clips they dont work anymore

mean_greenZ

iTrader: (1)

x2!!

jmm98LS1

iTrader: (28)

Thanks for the heads up guys, didn't know the links died. They should work now! I'll be sure to upload some new vids when I finish the new motor/exhaust.

180ls1

iTrader: (4)

ok i will be waiting that has to be one of my favorite sounding ls1's out there

SSpdDmon

iTrader: (10)

I don't think I would attach a number to the 2.5" vs 3.0" arguement. Just look at the 1-3/4 vs 1-7/8 header arguement that lingered around for so long. Truth is, you will gain a little more on a cam'd app. with the 1-7/8 headers. I had a stock internal '02 A4 Z28 a few years back and it loved the 3.0" true duals. IMO, once you have exited the header, you want something with as little restriction as possible that promotes good flow.

scottHMT

iTrader: (5)

Well I should be making about 430hp with my setup. I guess if i went with 3 inch I would see a small gain, but its alright. Car sounds nice, not extremely loud or lopey. Sounds much better than the Y pipe I had on it.