I thought I had proven it already. 99HP with and 120 with a full header. Either way since I am possibly one of the most respected members here and possibly more dyno time and VMAX's dyno'd then possibly anyone else with diffent configurations then anyone else perhaps you may want to consider what I have to say. If you want to make HP don't go with the Cobra's. Period. If you want to make HP go with ANY full header system. Period.