I also meant to mention - the 4.8is kit, while it looks fantastic, doesn't really "pop" on a black X. You would spend over $1k on it total and you wouldn't get that much bang for your buck IMHO. The kit looks amazing on bright contrasting colors like Imola red because the red is so dramatic against the black trim. With black on black, you really have to keep the painted parts immaculate so it doesn't blend in with the trim.

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2001 X5 4.4i
2002 Honda S2000