Hi,
I highly recommend Abo and South Coast Speed and Sound in Anaheim.
http://www.teamscss.com/
Abo worked on both my GTOs and is top notch professional and a great guy, very fair pricing. They can do any type of exhaust and anything else mod wise, minor or major including forced induction. Once my car comes in, I'm definetely going there myself.
Somewhatdamaged