I put up a couple sound clips on Instagram. And yes, with the CS, the drone hits HARD at 2,000RPMs. Bad. Like painful and the whole car buzzes bad. At 3,500RPMs, the drone is long long gone. Hoping the S-Line valvetronic mufflers help and of course the factory cats. If not, then I will keep playing around with the setup. It is a glorious sounding exhaust system though!
