VRS and Buschur. GReddy has one in development and Borla may or may not make one depending upon whether that borla guy was an imposter or not.

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Seems to me best combo for overall exhaust is: Exhaust (not catback), testpipe and header. Why? Because exhaust and testpipe do the most for the least $. Stock resonator makes it tolerable, soundwise, especially with header.

 

Yea I would hate for my exhaust to be louder than my stereo... thats why I havent removed the resonator. If I ever did, I'd get the silencer.