1971 GMC Donald

[mxerhale]

Now after a few trips up and down my 70 foot driveway, I made the executive decision that the 4" straight pipe was going to be too obnoxious for real world driving. I went on the hunt for a cheap slender muffler that I could tuck somewhere under the bed out of the way. I ended up finding a cheap 24" long 4" straight through muffler from Summit for $60 along with a couple bends to complete the exhaust far enough back to dump over the axle.

I envisioned the finished exhaust routing following the frame rail as it bends up over the axle similar to how a motocross or sport bike would look. The muffler had to take a few whacks with a large hammer to maintain some clearance with the frame as well as the straight portion getting some where it goes under the rear cab mount and past the cab sheet metal. The muffler was money well spent, it definitely quieted the engine to a very tolerable level to the point where you can have a conversation with someone while driving around.