Most dangerous mod ever. Wear a helmet. I pulled my knob off, punched myself in the nose, said some curse words and threw my knob across my apt parking lot into the woods.
There is a pretty good thread on E46fanatics which you should look at.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red