I do blown multiport EFI setups with FAST XFI systems. At this point in the game most of your major systems have very similar functionality and it really comes down to who is doing the build and how well they know how to tune their systems.
I'm partial to FAST because I've been using them for years and know the intricacies. Plus they sell their harnesses unterminated so I can wire everything to look like it was born that way instead of having to cut a harness apart and rewire everything. My only wish is that someday they go to a dual wideband 02 setup because diagnostically i've been burned by only having a single and trying to trace down a fault on the opposite side.
Bigstuff has dual 02 capability but last I checked they didn't sell unterminated harneses. Heard great things about their functionality and I've been told that the guy who developed Bigstuff developed the original FAST systems years ago so this in theory shoudl be an evolution.
You've got SupremeEFI here that deals with Accel and obviously knows it well.
If you have a shop that doesn't get your engine combo right, or doesn't know how to setup and tune your EFI it won't matter what brand you buy.
482ci FE, V7, intercooled with FAST XFI
