What can or should I do to increase the performance of my 1994 540i with 83,000 miles? Engine wise I can only think of adding a chip and perhaps a bigger air intake tube. But which chip - Dinan or Jim C? What else should I consider (within some reasonable price)? TIA, tsp -- to be removed from bmw, see /bin/digest-subs.cgi or email "unsubscribe bmw" to majordomo@domain.elided