Well after adding a set of Borla long tube headers, i finally had a chance to tune it. Well it goes to show just how good stock manifold/cat configurations are today! It picked up 15hp and 17 ftlbs, which is 429.7 HP and 422 TQ total now. This is through the stock catback yet.
If you look at the uncorrected numbers of 420hp and 414, im still doing great compared to others with bigger headers!