The closest that I can think of are some generics that my local Muffler Monkey put on a 78 Trail Duster I had a few years ago. They looked just like Flowmasters on the outside and sounded very similar. Porter Muffler on Atlantic in Roseville has been my exhaust guy since 2001. View attachment 1715284020
Sharp Ride! 3 inch Flowmaster 40 series have a significant seat of the pants power loss over an open 2-3/4 inch single pipe on a 2002 Z71, proven on my brothers beater vehicle
