I got a bit less than $1700 in the Holley HP system.
That includes:
Ecm
main power harness
Main ls1 24x harness
Holley coils
Holley coils wiring harness
Injector harness
5 bar map sensor
ntk wide band sensor
iat sensor
The harness plugs into all the rest of the factory sensors.
My friend has it on his Buick ta engine. It is the coolest thing since sliced bread. It took 3 passes before the ve table was at zero correction! The data logging is second to none...especially if you get the dominator. I've played with accel, fast and feast xfi, have seen motec, HP tuners, aem, etc.. The software on the Holley is the best laid out IMO. If you got a xfi, you could sell it and get the complete Holley system for what you sell it for.
They were having issues with the stock ls1 coils but that's supposed to be fixed. That's why I went with their coils. It would be even less if you used the stock coils.
I was quoted $2200 for a xfi. I believe that was minus a harness. The fast needs a separate xim box to control the coil packs.
