Originally Posted by U235
My first manual car was a 94 Integra GSR with an 8k redline. I was doing a 3-4 shift at basically redline and missed the gate and ended up in 7. Needle shot to 9.5-10k, I immediately clutched in. No issues, valves were the big concern. For peace of mind I did a valve adjustment the next day and nothing was out of spec. Drove the car for another 15k miles with no issues, then it was stolen.
Every engine is different though but mechanically the tach should show roughly an accurate depiction. If it only went into the yellow, you're fine. At 70-75 and miss into second, the immediate mechanical slow down would bring the speed down more. I think the m3 is at 65 at redline in 2nd so you'd still only be marginally over redline after the natural slowdown from all the mechanical resistance. I'd be surprised if you had any damage short or long term.
I meant miss the gate and ended up in 2nd. Damn iPhone.