F 250?

the rear end should be a 373... A friend of mine spent about 1500 dollars on one just like it and he now gets about 18 mpg in town and 23 mpg on the hiway.

He installed a K&N air filter and a computer chip with programmer and also cut the muffler out and put on a straight exhaust pipe.

His F-250 runs like a scalded ape... He raced a guy who had a maxima with accessaries and he smoked him on the quarter mile by 3 car lengths. He has a lift kit with wide tires and he had all four tires smokin...I would have bet all my money on the maxima because my wife has one and I know what they can do.

I already have a chip and programmer with the K&N but am getting the muffler cut out for 185 dollars. Mine is a super duty f-350 with the 7.3 diesel 4x4.