This was only used on a Engine Dyno for about 30 min. We tested it on a 331 inch 14 to 1 comp motor.ported Gen 3 heads, big cams. We spent 6 to 7 hours porting the base, enlarging, took 60 percent of the injector bump out, very nice. This has 65mm throttle body's, fuel reg and rail fittings. I made 659HP on this motor using a Holley system. comes with the correct TPS 2450.00 firm.