I just installed my smarty s-67 today and was playing around a little. I still have the egr and dpf but am planning to delete soon. I ran it a little on catcher 5 which was alright then jumped to 7 and really felt the truck come alive. Not sure but i think i had a little clutch slippage. But what i felt was at the top end the truck made about 38lbs of boost and the turbo sounded like it was surging. Whats the highest those VGT's with handle safely. Also and other tips on the smarty