I have a resonator delete with my Remus Powersound Muffler. The muffler sounds good without the resonator, makes a pop here and there but it creates some drone. I don't know about the responsiveness like speedfan said but that could be true now that I think of it. My friend who also just got a 330i is extremely quiet inside with the resonator, a silence that I've missed lol but the car doesn't feel alive..too quiet. As soon as I get my MMW headers I'm throwing the resonator back on along with quads.
| KW V1 | LCI rear | 359m Style | Michelin PSS | AA Stage 2 | Gruppe M | Remus | Mtech Rear | M3 Front |