Best Race motor?

[nbcaznmaster]

Okay, ima race soon so i need to know what the best motor should be. I wanna get be able to drive 15 minutes without pitting or at least get 7 minute runs for only ONE pit. Some nice speed. Coolhand recomened a 9XL, cuz it has long run times. My track is www.hobbyhut.com, look for pictures under teh RACING seciton, ti says OUTDOOR PICS. There are 2 striaghtways. What would be a good motor? woudl a hv-maxx be able to last 15 minutes? lol