ANYONE TRIED THE "IN THE STACK MUFFLERS"?
Been looking at the in stack mufflers like 4 states sells. For my applications they make sense, but do they work? I wonder if they rattle inside the stack? In a W900 application you could eliminate a lot of pipe and some bends, if they are reasonably quiet. I tried a Pittsburg Performance under one of my W900L trucks. Didn't really get any better fuel mileage, we installed it at a time when we made other changes so it is hard to tell. It is on my sons truck and he likes it as it is just a little quieter than straight pipes, but it isn't quiet.
Art Pfluger
Art Pfluger