miltek. its the future. i've heard it!
the best thing for you to do is listen to other peoples cars, that is the best advice you'll get, i promise. i made a massive mistake by not doing this, and entrusting the company i've bought 3 from (for RS turbo's and a cosworth. see where i'm going?) and i deeply regret handing over a hard earned £326. Mongoose is the name, and quiet is the game. even quieter than a standard exhaust. not good.
mine's a VR, but no doubt you'll want a nice note, and i'd say ring miltek and get it sorted.
hope it'll be helpful