Sounds really good. Just out of curiosity, did you consider the other oem exhaust mod (4 perforated pipes)? I'm torn between the two and would really like your opinion.
I think the ACM sound is what I want 70% of the time, but scared it's too loud the 30%. How is it with windows up?
Thanks for the most comprehensive review yet btw
Current: 2008 BMW M3 Sparkling Graphite/Bamboo Beige/6MT. 1999 BMW M3 Techno Violet/Dove/5MT. Next: 2017 BMW M3 Austin Yellow/Cloth/6MT