Is your HPR coated or raw?

Brent hit the hammer on the head, we tested the Q-1, Q-2, HPR 19, DSC-4 over and over and through the dyno graphs we would see the power dropping off the Q -2  Q-1 and the DCS-4 pipes, but the HPR 19 graphs stayed consistent.
 The DCS-6 also went to 1-375" ID on the stinger and ran over 15 runs on our last dyno runs and with no loss of power one hell of a good tip on design from Jerry Hall.