Back in 2001, I decided to dump my existing TBI and move to multiport FI. I sent my manifold to Force EFI (www.force-efi.com) in Miami. He drilled out my manifold and set me up with all of the electronics, wiring, etc. (At that time it was the SpeedPro system, before it became FAST). The system has always worked great. The hardware was top-notch, and performance was fantastic. Right now I'm moving that motor to another car, and I had a wiring question. I called them, and the owner was happy to hear from me and answered the question off the top of his head. Totally top-notch service! I know there are a few options for FI vendors out there for Buicks nowadays, but I still feel I owe a plug to Force-EFI. -Bob C.