Hello. I've done a bit of research and understood quite a bit about how to tune this engine. I do have a few question that i need to ask regarding tuning with p72 ecu. Assuming everything is wired properly and iab is controlling 1st solenoid. How is the first stage(0 to 3000rpm) tuned? Like below 3000rpm the car is running on 12v, so does this mean i am looking at the area below 3000rpm on the low cam?? Another question is whether this engine can be run on 16v all the time? That would mean the first stage is eliminated and then could the p28 be used to tune like a regular vtec? Looking forward to any help, thanks.