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I wouldnt put 3" on it. I would just remove the exhaust and resonator and that will improve on what he wants.I kept the 2.5" and I am happy with the results on my NP. Saw 2mpg increase in fuel mileage as well. I think if he went to 3" it would not have enough back pressure and he would loose what he is trying to gain. Just my .o2
03 NP
33" Pro Comp Xterrain,
7"Pro Comp Motorsport Lights
Diff/Transfer Gas Tank Skid plates, Breather tubes on Diffs/Transfer cases,
Brush Guard,OME 2" HD Suspension.MM9000 Winch w/syn rope