Does anyone have experience with this? Seems to give the tuner more control than vafc or emanage, but I'm a little unsure of what rpm increments it allows you to adjust in.

 

I have had two of these units. They are GREAT!!! Back in the day they were as close to a stand alone as you could get with a piggyback system.

I ran mine in there "standalone mode" at WOT. It controlled the timing and fuel. NO ECU input.

They are just kind of expensive by todays standards. I had almost $1000 in the units I had when it was all said and done.