Wow, I'm gone for awhile & Top Speed sells e9x M3 products now?!? They use to have a retail shop in my city years ago but it's no longer there. Their warehouse's in Addison which isn't too far from me. I inquired about the s/s exhaust so looking forward to what they have to say. FWIW, their stuff's legit. Back in my Honda days (Prelude & S2000), their stuff (intakes & exhausts mainly) was known to be less expensive than top-tier names (Greddy, HKS, Blitz, etc.) but I don't remember if performance was the same (probably since it was just intakes & exhausts). From what I remember, fitment was rarely an issue then again that was a long time ago, LOL! I'll post some pics of their products if I get a chance to swing by their warehouse one of these days.
'13 E70 S63B44A
'17 95B GTS