Looking for a 4" system to put in my Ford-Cummins conversion. I will be ordering a system for my year Ford, but I'll have to obtain a Cummins downpipe and adapt it. Shouldn't be much a problem (have MIG). I have found systems offered with: no muffler, or glasspack, or 8" muffler. Not sure what to order. I don't want an annoying hum or roar inside the cab, but do want a nice throaty sound outside. Suggestions on muffler type?
Danny
Danny