Do these have the same carbon build up issues like the RS4? Personally, not sure how I feel about RS5 and M3 combo. If it was me, I'd rather get a big sedan (think M5, S8, ect...) to compliment the nimble M3.
Current: 2008 BMW M3 Sparkling Graphite/Bamboo Beige/6MT. 1999 BMW M3 Techno Violet/Dove/5MT. Next: 2017 BMW M3 Austin Yellow/Cloth/6MT