you wont believe what the smarty does, it will make your truck into a totally different one.
the power comes in way quicker (low in the rpms) and just keeps picking up.
The most i have turned mine since i got my smarty was around 4200 in the lower gears, but have had it to around 110 MPH and still had a bunch of throttle left, and egts never got above around 1300 degrees.
on another note i have been running on SW #9 and i love it, can leave a big old cloud of smoke when ever i want.
and the mileage has got better, its 220 miles round trip to work and home for me and i am averaging about 21 miles a gallon thats 2 miles a gallon better then before smarty.
the best upgrade so far, next is gonna be injectors
Eddie