Will "true dueling" my '96 with 5.0 change my MPG? I wanted to duel it out with two mufflers but I'm not sure if I'll need to have an X pipe or not. If it's going to change my MPG I'm probabbly not going to do anything since I commute 60 miles per day and gas @ $2.00 a gallon!

 

I never saw anything but an increase in mileage - but I also had the cats removed - I now have true duals- no cats, and 30" glasspacks - sounds pretty good - not terribly loud but it has a real nice rumble. I guess the mileage thing may be an anomaly - but I havent noticed anything but a 1/2-3/4 mpg increase over non-true duals