Ron and Team: Thx for your excellent service, attention to detail, and pain staking patience explaining the trasformations underwent by my car. I now enjoy one fast 550i thx to you. Engine shift points are better, smoothness between shifts is awesome, and no more "bronco" like jerks. Next on my list: Dinan Stage 2 Suspension, Carbon Fiber Front Strut Tower Brace, and a DINAN BADGE with S2 serial to go along!