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View Full Version : 2.5" -> 3" performance upgrade



boosted_teg
09-12-2011, 04:47 PM
Hey,

Im just curious to see how much of a power increase/spool increase from a 2.5" catback (resonator also) to a full 3" to high flow muffler.

Currently i got 443 and 300 at 17psi on a 6265 .82exaust on conservative timing, but i know there must be some extra power to free up by swiching over, or is there?

:turbosmiley:

ISprayNosFg2
09-12-2011, 05:41 PM
3" gain in the midrange and will produce more torque than 2.5"
it been said over and over "either go big or go home"..LOL

i have a go power 3" exhaust

boosted_teg
09-12-2011, 09:00 PM
sounds good. I need to build a custom one, imleaning towards a K teller piping kit with a magnaflow muffler.

BoostedK20
09-12-2011, 11:51 PM
http://www.honda-tech.com/zerothread?id=1530154&page=1

Now, this is a different motor with a different setup completely. Those gains are pretty steep and a bit tough to believe. Regardless, my main point of posting that thread is to show you that a 2.5" to 3" exhaust upgrade is a very big deal on a turbo 4-cylinder setup. And a K20, IIRC, will rev higher than an H22/23, therefore a larger exhaust is even more beneficial.

:thumb:

Si Speed 317
09-13-2011, 10:44 AM
3" exhaust, especially turbo-back, works GREAT for top end. You'll definitely gain at least 20whp from the switch alone. The less restriction the better on a turbo setup.

boosted_teg
09-13-2011, 10:56 AM
:dance:

now i have to get to work

BoostedK20
09-13-2011, 11:00 AM
What are your options? Most likely custom I assume?

boosted_teg
09-13-2011, 11:10 PM
yup have to be custom, which is no problem. I was leaning towards a k teller with a magnaflow muffler and vbands, but my friend has a full 3" on his hatch back that said i can buy. He basically bought all the bends, cut and welded them together.

442whp and 300 trq. Id like to see 460 and 330 torque. My ultimate goal was to touch 500 on pump. Dont think it'll happen.

PetefromtheStreets
09-15-2011, 10:27 AM
yup have to be custom, which is no problem. I was leaning towards a k teller with a magnaflow muffler and vbands, but my friend has a full 3" on his hatch back that said i can buy. He basically bought all the bends, cut and welded them together.

442whp and 300 trq. Id like to see 460 and 330 torque. My ultimate goal was to touch 500 on pump. Dont think it'll happen.

The hatch exhaust will be a different. If I were you I'd go the kteller route. I made my 2.5" like that when I was all motor. And then I got a steal of a deal on a thermal r&d 3" and I gained power just all motor. So I know a 3" will give you more. Lucky you that you have a turbo to muffle the noise. Mine is just raw. Lol.

ksboi
04-12-2012, 11:00 AM
What did you end up going with?

Si Speed 317
04-15-2012, 07:15 PM
IIRC He went with a custom 3" exhaust