Don't go cheap on the FSR, the $40 ones off e-bay are garbage (I had 2 fail in under 1 yrs), seller swapped/no charged.

Went with Genuine BMW FSR and no issues in over 4 yrs.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!