Straight pipe for duramax
i think the stock pipe size is 3.75 inches a local muffler shop can do it easily, but getting a kit would be easier and you would benefit more from it
is it a classic body style dmax or nbs, that makes a huge difference.
is it a classic body style dmax or nbs, that makes a huge difference.
you can get a 4 or 5 inch system for the truck.
one thing on some lbz's is that when u straight pipe it might throw a code, wont hurt anything, but its annoying to have the light on all the time



