Originally Posted by ozinaldo
I am not sure if it's the resonator because there is a resonator with the OE pipe too but there is also the cats which N55 mids don't have. Somehow, it flows better and minimizes the drone. Of course, resonator might be different as well but from the looks they look similar. Check photos of both from my install thread, post 2:
Do you have drone with your set up?
I got the SS sport and stock mids, so I got some metallic drone around 1500RPM, but I think it is because of bad instalation of the exhaust, because when listening the music with hard bass(logic 7) I hear some bad metallic voice from the same place