Redd37
Junior Member
Hi all, I tried to attach a Flowmaster 40 series to my 3.7 because I was told the exhaust we run stock on an 07 1500 is a 2.5” when in reality it’s a 2.25” could I just throw a 2.5-2.25 reducer on both ends and call it a day? Would it still pass MD emissions or will I need to keep an OEM muffler in my parts bin? I currently blew out my outlet on my stock muffler and legally can’t drive my truck but hey, it is what it is. I know it’s not very good for the engine but I kinda like the sound on the low end with it disconnected