jlashley2001ss

iTrader: (5)

im basing this question on how these two different in sound. Is there much difference in sound with 2.5" true duals from headers all the way over the axle-----compared to 3" duals from headers to 2.5" over axles?

**Both have hi-flow cats
**Both have H-pipe
**Both crush bends

MeentSS02

iTrader: (11)

I would doubt they'd differ much in sound, but that is pure conjecture on my part, as I'm sure most posts will be on this subject due to people not having had both. Not sure you'll get a great answer on this one...

teke184

iTrader: (5)

i can't see why they would be significantly different.

if you're just gonna neck it down to 2.5 anyway...why not start with 2.5 and save yourself the ground clearance up front.

Ryanmgaspard

iTrader: (6)

I do believe a 2.5" exhaust is good for up to 500hp. I plan to do LT's and 2.5". Low end torque will be better also. I had 2.5" on my T-Bird and talk about no bottom end.

jlashley2001ss

iTrader: (5)

im pretty sure 2.5" from LT's all the way over the axle is what im doing. Stick a couple of medium powerpacks before axle and run pipe over axle.

senicalj4579

iTrader: (41)

Yeh man,just go with the 2.5. Youll have better clearance and your power potential will be a few ponies after 500. I wouldnt do 3" unless you really wanna get all you can out of it which would be about 800. Go with the 2.5

TheLS1Kid

iTrader: (12)

Is that 500hp to the ground or flywheel?

senicalj4579

iTrader: (41)

well thats not totally clear but if I was to make an educated guess it would be at the flywheel

TheLS1Kid

iTrader: (12)

Thanks man.

Does anyone else know for sure?

teke184

iTrader: (5)

there is no cut and dry answer....no definative hp number.

its not like someone has calculated that at 498.438hp you'll reach the max flow potential of 2.5" pipes.

senicalj4579

iTrader: (41)

well yeah there is no cut and dry answer if at the wheels or not but
actually there is a calulation for this. And the max efficiency of 2.5" duels are 513hp

jlashley2001ss

iTrader: (5)

so no real sound difference between the two pipe sizes?

senicalj4579

iTrader: (41)

i cant really answer about the sound. but i dont believe there is a big diff if any

slow trap

iTrader: (22)

the 3" should be alittle deeper imo.i'd say for a stock cube n/a 346 dual 2.5" and for a stroker motor that moves more air at a lower rpm or a nitrous setup 3" would be better.

jmm98LS1

iTrader: (28)

I've had both, the 3" sounds noticeably deeper than the 2.5" but it's not a night & day difference. If I read your post correctly, you're necking back down to 2.5" after the axle anyway, so the sound difference will be negligible.

jlashley2001ss

iTrader: (5)

im going 2.5" all the way...headers back