Deleting the A/C on your N52 is a requirement for all track cars. Removing the Compressor pump requires a shorter serpentine belt. Take the guess work out and pick up this E9X N52 A/C delete serpentine belt.

Fitment:
E8X 1 Series - E81, E82, E88, 128i
E9X 3 Series - E90, E91, E92, E93, 325i, 328i, 330i