[gnx7]

I run the Holley EFI (HP and Dominator) on a bunch of LS motors between myself and friends. Making anywhere from 600hp to 1400hp.

The software is very user friendly is the great part. Other aftermarket fuel management systems are not as easy to learn or navigate. You can run a composite style intake with standard style TB.... it can also be configured to run a single plane style intake with 4150/4500 series TB with injectors in the runners near the port. As long as the computer receives the data it needs.... the motor can be tuned (self tuning feature is very nice on it), data logged, etc.

Read up on the Holley features. It just came out with Flexfuel. For a naturally aspirated motor on lets say 91 octane and 11.25:1 compression it would make 500rwhp for example. Drain the tank and add e85 (with enough injector/pump) and it will gain 10-15rwhp from timing alone.... which the computer will recalculate the fuel changes for you! On a forced induction car you can add 500rwhp+ from the octane/timing/boost e85 allows.

Traction control, 2 step launch, data logging, up to 100% added automatic fuel enrichment (if a regulator or pump goes bad), lean cruise, low oil pressure auto shutdown.... many other cool features.

I don't run the Atomic EFI version of the Holley.... it's probably bang for the buck cheaper than the HP/Dominator.

My new LS motor is a 4.190" bore resleeved 5.3 with 4" LS7 crank and Titanium rods making 13.5:1 compression with AllPro LS7 430cfm heads and single plane AllPro intake running a 4500 series throttlebody on e85. It should be alive in April/May timeframe. Goal is 700rwhp all motor and 8000rpm when needed (road racing). It will be using the Holley HP efi.