Reviewed By Ben M (WINGETT RUN, OH) Reviewed for a 2005 Ford F-350 —9/26/2014 7:53 AM
If you have this truck with the 5.4, you will take any improvements you can get on these windy, hilly roads in SE Ohio. Tested truck repeatedly on a 3/4 mile hill with a 8% grade, driving as though I would normally unloaded using 93 octane. Stock from stop: 3900RPMs at 31 mph, no acceleration available without downshift VS Performance: 3100RPM at 37 mph and accelerated without changing gears. Mileage XS gets about 1mpg better. Heavy towing setting make huge difference with 10000lbs. Worth it!