shootinok 15 #1 Posted July 3, 2011 I put a stack on Festus Used a straight muffler from Atwoods listed for an IH. You can see through it and it has baffles sticking into the center around the inside. Anyway - HOLY SMOKES it's LOUD ! Should these engines have back pressure on the exhaust ?? Don't want to fry my exhaust valve Share this post Link to post Share on other sites
