lol portaman, to be honest with you, the muffler sounds a little bit louder, not higher pitch, but louder. i felt a small increase in power, around 5k up to redline.
and the most coolest part, is since i have a fmu, and a striaght through exaust too, when i rev up real high, flames come out of the exuast. i have pictures to prove it. no spark plug in the muffler or anything