I've got the AA exhaust and absolutely love it. It doesnt drone at all on the highway for me. I'd definitely recommend it if you are looking for something more aggressive but nonobtrusive.
1995 M3 Coupe - HPDE/Track Prepped - For Sale
1997 M3 Coupe - BMWCCA I-Prepared Race Car
2011 335d - Das Uber Commuter (35.1MPG Avg)