How does the MVVS 91 compare with the OS91FX?? I probably should just get the OS, however, I like to try different brands sometimes. Give someone else a shot at my money so to speak. Probably depends a lot on how it is piped. I was thinking of using one of the Jett in-cowl mufflers instead of the stock muffler. Would require less hacking of the cowl and front of the fuse.