exhaust size?

[koolkoreanked]

I have 2 H22s right now, one which is going in my car at the end of this month the the other one I'm building for turbo. My question is, say for example my manifold ends in a 2.5 in exhaust. Would a 3in down pipe all the way back make it flow any better? Or would 2.5in all the way back make more sense?

Thanks for the help

[turboh22aakkord]

I have 2 H22s right now, one which is going in my car at the end of this month the the other one I'm building for turbo. My question is, say for example my manifold ends in a 2.5 in exhaust. Would a 3in down pipe all the way back make it flow any better? Or would 2.5in all the way back make more sense?

Thanks for the help

i hope your talking about for the turbo setup.... cause 3" on an NA is way to much... even if it was cheap crush bends it still wouldnt give much back pressure and you would lose power 2.5 works pritty good for NA thats what i ran before i built my turbo setup (some will argue this but i had no troubles)... as far as the turbo setup goess... run as big of an exhaust as you can fit

[h22sparkle]

2.5 exhaust back for n/a and 3 for turbo ive seen people go higher for turbo but i wouldnt.

[koolkoreanked]

i hope your talking about for the turbo setup.... cause 3" on an NA is way to much... even if it was cheap crush bends it still wouldnt give much back pressure and you would lose power 2.5 works pritty good for NA thats what i ran before i built my turbo setup (some will argue this but i had no troubles)... as far as the turbo setup goess... run as big of an exhaust as you can fit

Yeah its for a turbo set up. Thats what I was thinking. With a turbo... as big as the speed bumps will let you. So this is true even if the turbo manifold only has say 2.5/2.75 outlet??? Yeah I know about the loss of low end tq... there isn't much... The way my exhaust is now its like running the stock manifold into the stock downpipe and having them dump right there. All I felt was a power gain everywhere.

[turboh22aakkord]

Yeah its for a turbo set up. Thats what I was thinking. With a turbo... as big as the speed bumps will let you. So this is true even if the turbo manifold only has say 2.5/2.75 outlet??? Yeah I know about the loss of low end tq... there isn't much... The way my exhaust is now its like running the stock manifold into the stock downpipe and having them dump right there. All I felt was a power gain everywhere.

yeah, i built a 3" dp for my cb7 and that was a bitch... and jesus.. there isnt much ground clearance.. i had to put my coil overs about half way up just to drive it around ( i made a little skid plate for the DP too ) if i had it over to do again i might have just made a smaller 2.5 inch dp cause i would have been an easyer fit and then ran that to 3" back.... as it was i had to notch the crossmember and re-weld and patch it just to fit the 3" DP in... good luck dude..

[prodigymb]

im running 2.5 inches all the way and i happy with it. on a turbo setup.

[jm991700]

it depends how much hp u want to make. 300 and less 2.5 will do fine. more the 300hp go 3 inch.

[vinbon63]

it depends how much hp u want to make. 300 and less 2.5 will do fine. more the 300hp go 3 inch.

Wow that came outta nowhere...bringing this thread up from the dead eh!

[MR.PHIL]

it depends how much hp u want to make. 300 and less 2.5 will do fine. more the 300hp go 3 inch.

Wow that came outta nowhere...bringing this thread up from the dead eh!

[jm991700]

QUOTE=vinbon63;1627417]Wow that came outta nowhere...bringing this thread up from the dead eh![/QUOTE]

Damn i didnt even check to see it was that old.
[

[quickangel93]

i hope your talking about for the turbo setup.... cause 3" on an NA is way to much... even if it was cheap crush bends it still wouldnt give much back pressure and you would lose power 2.5 works pritty good for NA thats what i ran before i built my turbo setup (some will argue this but i had no troubles)... as far as the turbo setup goess... run as big of an exhaust as you can fit

its been proven that a 3" for a n/a h22 gains more hp. so i doesnt matter. but i would run a 3" weither or not you have a big turbo or not.