I have a power box for a C-15 mxs serial number. The box adds additional 230 hp and 700 ft-lbs torque. I gain lil over half mile to gallon running it on #1 setting. Bought it for pulling and drag racing so i dnt need it anymore. Its a lil over a year old asking $2000 shipped. Any questions feel free to contact me At 724-317-74three zero.