400hp magnum on DPI

The best thing to learn the Holley systems is to go to their website, and forum. There are several Holley systems, all using the same HP computer. The only computer that is different (in current systems) is the Dominator, which is more capable yet.

There are several harnesses you can buy. I BELIEVE there is plug and play stuff now for the hemi's but I don't pay attention. You can also get a "raw" harness and interface your own.

"In short" the Holley system uses mostly GM based sensors, but are proprietary for some. They claim their O2 sensors are "special."

Things the Holley system gives you that OEM does not is stuff like logging, full configurability, you can use TBI, multiport, bank fired, sequential, and there are outputs to control "other things." My understanding is that the Dominator will control electronic transmissions but the HP won't. Again I'd go "over to Holley" and read up. Also, you can download the Holley software free and play with it some, to get an idea. Holley comes with sample maps and IS "self learning."

The big downside to me with Holley is that the ECU is sealed, but then, so is OEM.

Also, Holley makes some different displays which can be used, or a laptop. Their new "in between" display (about 200 bucks I think) will pretty much fully program the system with no laptop, as well as display various data and gauges.

AGAIN the best way to check this out is right at Holley and their forum.