You'll also need bigger cams to break the 300hp barrier. McKinney said he spent lots of time working with Mark Chacon at Bullet Racing Cams to design profiles for the 2V engines. He recommends his Stage 2.5 NA cams that spec out at 228/226 degrees duration and 0.550/0.500 lift on a 108-degree lobe-separation angle. Unfortunately, McKinney doubted if those cams would pass a tailpipe emissions test. So McKinney recommended his Stage 2 Turbo cam: 222/218 duration, 0.525/0.500 lift, 115-degree LSA, and said it would probably make 5 to 10 fewer horsepower at the wheels. McKinney said he prefers the smaller exhaust lobes with the PI heads because the exhaust port flows very well.