I see 906/915 flowing 212-218cfm stock meanwhile the stealth's are flowing around 275-290cfm out of the box and have the iron beat through out the low lift flow range so it's hard for me to tell a guy not to just change pistons and go w/stealth heads.
If it was me I'd buy the stealth heads and make them work cause I wanna go fast and not fart around.JMO:cheers:
right on mike, good luck!