I'm discussing with a buddy who's a builder and will do the work, since I have a 318ti that's got the head pulled and various work being done with my son (too many projects!) I'm going to do the complete fuel system at that time (LPFP forward) and need to sort that out with Steve @ Fuel-It. The Z4 is a quirky beast ... unclear if it needs the LPFP. Same pump but handled differently than the E9x. I'd rather land on the conservative side of having fuel right than letting the DME save my motor to figure out if/when the LPFP is needed (old school I guess).
One of the nice parts about living in Northern Virginia is that one can treat winter as a time to take the car off the road and work the meat and potatoes upgrades
. Looking forward to getting the smartcoils installed, too, and not running those retardedly bent ground electrodes with the Eldors!
Filippo