Hey, im running a p06 on a y7. My friend gave me a vtec head and a vtec controller. He said I can run the p06, and engage the vtec wit the vtec contoller with a postive voltage wire and stuff. I know thats possible, but doesnt the p28 have a better air/fuel map and stuff? Also, i think the p28 has a speed limiter of 135, while the p06 has it governed at 118? Basically, my question is if there is any advantage of havin a p28 over a p06 if im running the vtec separatly?