Dinan all the way.. with the stage 3 software and throttle body she loves to rev (and quick)! AEM intake and a new exhaust/resonator delete will perminately cure my X5's asthma.

As for gas milage I don't reset my CONS1 and I've averaged 20MPG over the last year with roughly 60/40 city/highway use (but I also know when to throw in the clutch and let the hill do the work so your YMMV)

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2003 X5 3.0i Manual, Premium, Sport, Nav, Cold Weather, Intravee II, Dinan Throttlebody & Engine Software