Try out the following web sites:
http://www.bissonmufflers.com/en/muf...mageField.y=10
http://www.chiefaircraft.com/cgi-bin...html#evolution
The MVVS is a rebaged as an Evolution , 35GT, Bisson
Are you happy with this engine? I have a 26 MVVS with a 1.60 Pitt part # 5516 MVVS from Bission
Mike