Hey...I went to the local yamaha dealer today and I was asking him some questions about power commmanders and what exhaust system to use?? He said that the gyt-r full system is the best out there. I looked around and I found the article on the 2006 raptor pipe shoot out from the atv rider mag. Also the dealer told me that the 660 was just as fast or faster as the 700..and the 700 had a rev limiter?? WTF is that?? Something that lets your engine go to a certain rpm and not go over?? If so is that a bad thing?? Thanks again