I am not really into maitenance. I pull my bobcat or tractor on a gooseneck or move my dump trailer. The truck doesn't do a whole lot of running. I usually show up to a job that morning and leave that afternoon.
I am just trying to save fuel over all.. I've looked at exhaust and have had trouble finding a 4in for less than $450. Do you have a good source?
I'd never do a stack. I've already gotta a transfer tank and toolbox in the bed.