- OK. So the full info on Kevin Kurdziolek's Cobra. Jason Roth built. L&M 9.5:1 CR Motor, Gen 5 3.0 Whipple Crusher, 4" upper pulley, 2# lower (18 psi), ID1050X Injectors, Stock Explorer MAF, Fore Return Fuel System, Kooks 1 3/4" Long Tubes, Kooks 3" X Pipe with Green Cats, McLeod 1200 RXT w/ 26 spline input shaft, Stock T-56, E85 Fuel, 04sleeper patented "Sauce" tune. 814.6 HP / 649.8 TQ