Hi, I'm new to this site. I recently blew my motor at the last HPDE in December after passing a Ferrari that was too slow through the “S” s at COTA. I’m now considering having a new ZHP motor installed by the dealer at a cost of $12 K versus looking for a used ZHP motor through an independent BMW repair shop. That’s just because I enjoy the car so much. Can I get some advice on this issue? Thanks! Sam.