Just installed the Solo mach shorty with high flow cats and Kooks LT's. I agree with everyone else here, it sounds amazing. My only gripe is the sound it makes at gear change. It's hard to explain but instead of being a pause in the note during the gear change, there is this rollover sound that I can't say I've ever heard from a car before and doesn't sound right; almost annoying. Does anyone know what I'm talking about and have any input to whether this is normal or not?