Originally Posted by
hsukaria
The Tower-type mufflers I got with the JBA and SK engines are quite heavy compared to the Jett tuned muffler even though they are a lot shorter.
They're castings that they machine down. The Jett muffler uses a casting for the front part and aluminum tubing for the center and the machined end cap with stinger. So yes, I'm sure the copies are heavier since they're all cast.