Ok just has studs and egr delete put in and the dealer decided to put a cold start update in the truck and now im geting 14 mpg and it just doesnt have the power like it used to have. I run erics extreme race and its just not there. The only other change is I took the stacks off and put 4" duals with a muffler. I cant believe the muffler has made it that slow what gives? was it the cold start update? Im planning on doing ficm tuning soon.