The BEST way to spend 1k to make your X faster, easy, enroll in a high performance driving school. I did Skip Barber (E30 M3s) and Bob Bondurant in the early 90s. Best money I ever spent on performance, and this is from someone who had John Henessey do the full Venom package on their Viper.

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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!