RLV-4117 "Mini 91" Muffler

RLV-4117   This muffler was designed for AKRA / WKA / FKA Box Stock class rules to replace the #89966 B&S style muffler.
It will be allowed under AKRA/WKA/FKA rules beginning Decmber 1, 2010. 
It will become mandatory starting March 1, 2011