teatersroad
What's a henway?
Is there any obvious indication that the cat mufflers are more restrictive, or if they are less responsive than non-cat to being opened up a little? If they are more restrictive is it in the internals or in the port? Outside of intuitive distrust of epa tuning, I'm curious. I added a port in a 346 cat muffler, downstream of the internals. The performance boost was remarkable, really I can't complain that my muffler says cat on it, and if it's cleaner then that's fine too. Likely this saw will see a little porting/cp work, but I can't see bothering with swapping out the muffler.