I am seeing all these tunes, downpipes, intakes and exaust for these things. Does anyone know what these motors will take and live a long life on 91 oct? I am coming from and 03 Cobra that was making 750+ to the tires on 100 octane w/stock motor and ran it HARD for years. I know the Cobras were (pretty safe) at 800 or so with the right tune from MR BROOKS, and fuel. Anyone really leaned on one of these trucks yet?