Bruce, FYI, I've been cutting the tips off of the Bisson mufflers for years for that modest rpm gain. Same with the 6.4 mufflers on the new engine. The 6.4 is actually 2 of the 3.2's back to back if you think about it, but I KNOW that the larger diameter pipes on the 6.4 sound a lot quieter than the small diameter pipes on the 3.2 Bisson mufflers. Talking to Gary over a long period of time and I learned that the 3.2 likes a 3/4" diameter pipe for the exhaust. Same pipe that's on the 6.4.

If you have the inclination you might want to talk to James at Bisson about that, since they will do a custom application. I'm going to be doing the same in the near future for the reasons noted above.

Pat