I just wanted to introduce myself to the board. My name is Mike. I am looking to buy a 99-01 E38 as an alternative to a late model S500. I've read and heard many horror stories from the Benz crowd (owners and techs) regarding poor quality in the S500s'. Plus after reading Bimmer #55's buyers guide for the E38. I am convinced to get an E38! My first questions are: Is BMW's current DVD navigation software compatible with the 99-01 E38's? Also, any E38 owners have success with the Dinan intake, ECU, and exhaust upgrades?