Getting ready to put a new exhaust system on my 02 grand caravan 3.3L and am wondering if an increase in the pipe diameter would inprove my gas milage as it did with the 5.7L in my Ram. i f it would, what would be the suggested increase in size? Thanks in advance for any help.

 

I doubt it would help mileage, but an alignment might if it were off enough to increase rolling resistance.