Ok i have done some searches... but still wanted to find more of you HT member opinions..... im going to soon turbo my ls (stock.... 6-7 psi) and i was still wondering what you guys should recommend..... 2.5, 2.75, or 3 inch exhaust piping.... what are the pros and cons of having either of these ones... thanks for all that help

 

bump before sleep

 

3" turbo-back. bigger IS better

 

3" rules...

 

3" indeed. I love my thermal mmmmmmmmmmmmm!!!!!

 

If you don't have an exhaust already, then there is no reason not to get a 3".

 

I was actually thinking about having a 3.5" exhaust made and doing a stright up dyno comparision. I wonder if anything bigger than 3" would make more power.

 

do you guys think that having a 3 inch, is gonna be loud as ****? like over 110 decibals?

 

my Thermal 3" is loud as ****...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Vinhtran17 &raquo;</TD></TR><TR><TD CLASS="quote">do you guys think that having a 3 inch, is gonna be loud as ****? like over 110 decibals?</TD></TR></TABLE>

Depends on if you choose to do-away with the resonator and cat. Essentially bigger is better - the less back pressure (ie. the more flow) in the downpipe and exhaust, the quicker the turbo will spool. Thats why some just have a downpipe and not a full exhaust, so there's basically no resistance.

Something you could consider would be having a larger downpipe than exhaust. For example on my setup I have a 3" downpipe which tapers to a 2.5" exhaust, responator, and muffler. You would for sure notice a big increase in spool time having a full exhaust opposed to just a downpipe, though it'd be loud as ****, but bearable

 

isnt there something bad for having no back pressure though?

 

you dont want any restriction w/ turbo

 

ok ill get the 3inch piping.. but i'm gettiing a good deal on the custom piping for like 100$.... but im not sure if i should have it before the turbo.... because the turbo its not gonna be installed for at least another month or so....

is it bad to have 3 inches as of stock ls (well i have short ram intake, and thats about it)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Vinhtran17 &raquo;</TD></TR><TR><TD CLASS="quote">ok ill get the 3inch piping.. but i'm gettiing a good deal on the custom piping for like 100$.... but im not sure if i should have it before the turbo.... because the turbo its not gonna be installed for at least another month or so....

is it bad to have 3 inches as of stock ls (well i have short ram intake, and thats about it)</TD></TR></TABLE>

Im not aware of any adverse side-effects of having no back pressure in the exhaust. I do know that if you dont have any back pressure comming out of the head (ie. no manifold) it can possibly cause damage to the valves or something, im not really sure, just heard of that before.

 

3 inch

 

Is it allright to run a 4inch downpipe and 3 inch exhaust? or just stick with 3 and 3?

 

just get resonators to quite the sound...mines not that loud...sounds like regular exhaust, maybe a little quieter

 

3" for sure, will help spool the turbo and you ll be just over happy with it..

4" downpipe? you got enough room there?

 

I got my exhaust from http://www.kteller.com and I have had many compliments on how good my exhaust sounds. It's really deep sounding and I love it. I was worried about the 3 inch being loud, but it's actually very very quiet. I have full 3 inch exhaust, a 22 inch resonator, and a magnaflow oval style muffler.