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I have a 03 350z touring with Borla Headers with Injen Cat Back Exhaust, im looking for something not as loud. Any opinions something more mean and throttler if that makes any since. And any body ever use a exhaust silencer? Thanks for the help
For the control valve, it's a flap you control with a lever, so you can either close the flap all the way or at a certain angle. So yes, you can control the volume. They've been used on muscle cars and exotics for years, and Meisterschaft's exhaust for the 350z has it, but it's 2k just for the muffler.
I dont think the butterfly valves are necessary. The volume that the engine produces is just not that loud. I think you should focus more on drone rather than the overall volume of the exhaust