Dude, those are hella nice numbers, and look at that crazy torque curve, flat at 200 ft lbs. I think you are running a bit rich in the low end.
Nothing wrong with running 9 psi on the stock motor, I do it every day
Now what you need is a 3" downpipe, hopefully Blacktrax made a jig so they can make more:
My Custom DP (56K nono)
