I just took the under dash panel out, its two pieced and there is only two Phillips head screws holding it in.
Then I removed the panel on the side of the console, next to the gas pedal, just one plastic phillips screw holding on the vent piece and one regular phillips screw holding on the panel.
With those removed, I just stuck my hand back there and unplugged the gas pedal and installed the sprint booster.
The whole job only took me 10 min tops, but I'm used to taking cars interiors apart, I do it for a living.

The Sprint Booster works good!
Its a bit touchy though, just a little press of the gas pedal and it snaps your head back if your not careful, a least in my SRT it does and I kept chirping the tires around corners by accident.