Here in germany its now a fashion to fit a yam R6 muffler on the grizzly. The advantage are , good looking , reduced idle speed , no rusty muffler , good sound, reduced engine temperature, lots of cheap used R6 muffler over ebay.

I´m close to get also one on my grizz. My question is now on the experienced grizzly owners. Need I to rejet my carburetor , because of the different back pressure of the exhaut gas.

cheers reinhold

 

Yes, normally when you put a new exhaust/muffler on, you rejet.