So I have a stage 0 and a zpi 2.5 s pipe and mid pipe with a tsudo axleback. The fitment on the axleback sucks and it's crazy loud. How bad would it be if I went with something oem fit like the megan or trd, which happen to be 2.25. Would they be quieter and how bad would it hurt my performance? I plan on going up to 8-10 psi and I only want about 250 at the wheels.

Thanks

 

Well I have the Greddy EVO2 axleback and a 2.25" straight pipe where my resonator used to be and I don't see nothin wrong with it. Sounds really nice too. Eventually I might get 2.5 or 3" all the way through but that's for bigger HP gains. If ur only lookin to get 250WHP then save some cash and just use ur OEM fitment. I'm currently @ 272WHP with 2.25" pipes. And also, I'm sure if ur tuner knows what he's doing, u can EASILY get 250WHP with 8 psi, no need to up it to 10 lbs, that's just more wear on ur engine u don't need.

 

Cool. Just making sure. Is there a big diff between running the TRD and the OEM axleback?

 

you don't want to up the boost on a stage zero without an intercooler and engine management.

anyway, with a turbocharger you want the exhaust to be as unrestrictive as possible because the turbocharger itself is a restriction on the exhaust system.

a really good exhaust with oem fitment is the dezod s-pipe back 2.5 in exhaust, and you can get them with a second sound chamber to quiet it down, and they are very subtle looking.

 

the difference between trd and oem exhaust is sound that is it.

also, if you increase the boost, you'll need bigger injectors too. or you'll lean out.

 

I'm not sure but the TRD might have better airflow, otherwise I don't see a reason for them to even sell one...

 

with the trd exhaust, you get maybe 2 hp, trust me, i have one, it just sounds cool, but is nearly as restrictive as the stock exhaust.

 

You get 2 HP when you're N/A. I have a full catless exhaust (2.5" ZPI Spipe, Midpipe from the Tsudo N1 catback, TRD Axelback). By the time the exhaust gets back to the axelback section there really isn't much backpressure - the main things that cause the backpressure would be the Cats. TRD axelback does flow better than the stock muffler.

 

Not to thread jack but how do u pass inspection with an S-Pipe? I thought those remove the cats and pretty much screw ur chance of passing an inspection?

 

I have a PWR intercooler, so no prob there. And I know it needs to be open, but I just want quiet too.

 

Getting 550's and a retune next month.

 

U don't need 550's if u only want 250WHP, unless in the future u plan on 350+WHP. Otherwise 440's will do just fine. I'm runnin 440's and I'm @ 272WHP

 

The cats aren't in the s-pipe - they're in the header and midpipe.

 

Damn all this time I didn't change my S-Pipe because I thought it had the cats, are u satisfied with the zpi? Now I'm gonna have to change mine to get some more power...

Sorry for the thread jack!!

 

Yeah but I bought it used - don't feel like dealing with ZPI directly. There's other companies out there with midpipes.

 

I like my piping, but I plan on this thing being a daily driver so I had a shop weld in a high flow car and a resonator. I'm getting 550's cause 440's are almost the same price.

Thanks