After flushing the coolant system with restore and restore plus, doing the oil cooler with an OEM one, doing the STC fitting, Sinister full EGR delete, blue spring kit, and a 4 inch MBRP straight pipe, I've noticed there isn't really any "power" and the MPG is horrible about 8 mpg. No codes besides the P0401 (I left the EGR valve plugged in).. Seems like it lacks acceleration. On my way to work I had to hit 2000 rpm before it seemed like it wanted to move. It's not cold out, I'm in south Florida. Any suggestions? Thank you.