I have purchased the Dynamite tune pipe and the MIP tune pipe and have had less than stock performance out of both. The craftmanship of the MIP header was terrible and required dremeling to get good flow. I am extremely dissatisfied with both of these pipes and would not recommend them to anyone. PS...I know how to tune my carburator. I had an old Associated Top Speed pipe which I tried with my stock header on a whim and was pleased to have gotten more mid range torque and more top speed than stock.