I run the Holley HP EFI, and I really like it. There is some good support on a couple of forums for the unit as well. I used the FAST in the past, and I like the Holley much better.
The HP EFI only supports a single O2 sensor. I do believe that the Dominator will support 2. I've had no real issues with running a single sensor. I had bungs installed in both exhaust tubes so that I can choose to run it in either.
It would be nice to have more than 8 I/O (4 inputs, 4 outputs), but with some planning I was able to do all that I needed to.
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