[RiefferD]

Let me preface this by saying that I am a BMW tech, and have been for 12 years now. The drivers manual specially cautions against revving your engine the way your friend was doing in the video for a reason. Doing so can you can cause friction wear on the cylinder walls, piston rings, and pistons. Additionally it can cause excess gas to go into the exhaust and ignite in your catalitic converter. Gas ignition in your exhaust melts the ceramic emission filter, which then makes the car run like having potatoes in the tailpipe. Even though the car isn't in gear, the gears still will turn, so if you rev it up, it also can cause gears to wear down. So that's my point, and I'll state again I've never revved my engine that way, and I won't. If you cosign on treating your car this way as if it's no big deal, I feel sorry for the sad individual that mistakenly purchases your car. Just my 2 cent.