135mph running against a b7 s4. It felt very solid, but I think my e90 328i sport felt a little better at high speeds. The e90 I had that up to 145 and I let it off.
Only bad part about this is BMW speedo's are way off. Mine is off by 3 mph. I believe this is a known fact, at 75mph I used my garmin and it said 72mph
so imagine how much more off it is at 140mph.