We have just complete the first round of testing on a stock 3.6l 964. In comparison to the current leading brand header, we made only +5.5 HP and + 5.2 ft-lbs of torque more at the rear wheels. This is a good result but we are not satisfied. Consequently, we are doing a re-design on the 3.6 version that should be ready for test in a few weeks.
One thing I should mention is that we're doing extensive testing on this product on both the dyno and the race track to ensure it has good performance, reliability and servicability.
Jim