Did the complete Dinan S2 upgrade (everything but the turbocharger) - My X5 now flat out GOES! Imediate throttle response. Awesome roar from the pipes. Almost 3 yrs now and flawless performance. It was like rebuilding the engine and giving it a new lease on life with 30-40 more hp. A couple other members drove it and called it "a BEAST!" Yes, it's expense, but (IMHO) well worth it. Sure, you can piece together a number of similar improvements from other manufacturers that may end up less expensive. But having everything made to work together and have BMW's okay, really makes it worry-free. Making a 5000lb vehicle preform like a 3-series is truely an amazing feat. I've flat out left 5.0 Mustangs behind.

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, Mk4 Nav, complete Dinan S2 , hitch, V1, tint, BSW Stage 1
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Life is not fair!
You can't protect people from their own stupidity!