Wondering what is the popular dual exaust system that is being used from the catalytic back on the f-250/350 gas models ? Does it save gas ,and increase performance? How much would it cost ? Where is a good place in Canada to get it? I would prefer a deeper sound ,but not to loud .???-thanks

 

The popular one's are flowmaster and i think magnaflow they claim 1-3 more MPG.

 

what year / have you check or changed your y pipe some y pipes are choked down and it harts all three fuel, power,trok/ it goes from 2 1/4 to 1 1/2 to a 3.00 pipe check it frist