My hp goal for now is anywhere from 260 to 290 to the wheels. I don't have a problem paying for a new plenum, KJR pulleys, an exhaust (getting HKS hi-power in two weeks), and other NA mods.

The main problem I have is with test pipes/hfc. They're rediculously loud, and I would never want my car to sound like that. Under WOT, it might sound nice, but during normal driving I wouldn't be able to bear the noise.

Is it possible to get 260-290 HP without adding HFC/TP? Are they crucial to making high power for NA? With the addition of a new plenum, KJR pulleys, HKS exhaust (I already have a popcharger), maybe headers, and a good tune, would 260-290 hp be out of the question? or would it be plausable?

What other NA mods would you guys think are crucial to making high output? I'm trying to stay away from messing with the internals, so no head or cam work.

Please help me out, Thanks

 

I did'nt think HFC's were loud? Good questions...

 

JWT clutch to put the power down. Unichip or Techosquare reflash to tune the addition of all your mods. 260rwhp is definitely reachable, but 290, you would probably have to do cams.

 

Buy my sig and you'll be 290 or close to it.

 

The test pipes are actually pretty quiet untill you step on it. They sound like stock at idle.

 

full exhaust, plenum, pullies and lightweighted flywheel + a good tune with Unichip or EU; you should easily be in the 270's whp range

 

Awesome. Thanks for the responses.

 

Lets back up a bit. The primary noise reducing items are resonator and muffler - not the catalytic converter.

Lets keep it simple and stick with the OEM exhaust. Add headers and test pipes for performance. Neither makes any noise. What you have done is increase the volume of air passing through the exhaust; therefore, the exhaust will be more loud.

So quiet and air flow (performance) are at odds with one another.

 

what he said...
My exhaust gets quieter at higher revs cuz airflow gets hindered at higher RPMs. Its weird. But basically, test pipes don't make it much louder. Adding a loose muffler however, makes the car ALOT louder.