I've got the Active Autowerkes exhaust. Don't listen to anyone who says it drones. Most of the exhaust systems on our cars cause a tiny resonance that affects the rear center console that can be easily fixed. The sound I think is a perfect mix of performance and comfort. I drive on the highway a lot and don't have any issues whatsoever. Just be sure to fix the rear center console theres a DIY for it somewhere.
1995 M3 Coupe - HPDE/Track Prepped - For Sale
1997 M3 Coupe - BMWCCA I-Prepared Race Car
2011 335d - Das Uber Commuter (35.1MPG Avg)