Originally Posted by
Serban I've seen some guys use the STI muffler, which is one option, but has anyone tried any other OEM mufflers? Something with an inlet of 2 3/8" or 2.5"?
That's why I bored mine out to 3", and removed the 2.37" pipe that goes in. It's all 3" up until the wall hitting baffles.
It's a big muffler and hard to fit in a lot of cars, P11 fit perfectly but B15 I had to get creative. It's still restrictive too, I lost about 5-10whp according to virtual dyno on my B15. But having a quiet non droney exhaust makes it worth it. At full throttle at 50 feet it measured ~88dB at my local Autox course, I listened to it while my friend raced the car and it was as quiet as stock cars at full throttle (with turbo).
Next time I do an exhaust I probably will use 3" round mufflers that are nice and long. Oval mufflers don't have the material density on top and bottom.
Originally Posted by
ny5speed The turbo will go a long way in quieting things down on its own too Shawn.
Amen to that.
@Shawn B:
Same exact motor SR20VE with N1 cams, same exact exhaust 3" VRS piping with 3" bored STI muffler. Only difference is one is NA one is Turbo.