The Walbro part number for this pump assembly is "TU282HP-2". Not sure about TOTAL HP for this pump, but Walbro states it: "has the capability of supporting Mustang's sporting up to and over 500 horsepower." I bought this to fuel my '08 GT which is currently producing high 480'sHP (not going to take it higher because of stock internals). The BAMA tuner said this would more than support my setup (Saleen blower@7psi, GT500 TB, GT500 exhaust, JLT CAI, and a few others) I've had the pump installed for about 4 months now and it is working very well. I made a comment on 24 March for this same pump on LMR with the ONLY issue I've had. Please take note of that if you purchase this pump and have a metal gas tank. Hope this helps.