Welcome to the boards!! If your planning to do any Dinan work to your 4.6, that truck is going to be one bad ass X5!! It might take some time for Dinan to get the softear going for the 4.6 since its new. I currently have the a 00'4.4, w/ Dinan upgrades, and its FAST!! I couldnt imagine Dinan upgrades in a 4.6. You'll be creeping up on the M5's horepower. Goodluck!!