I have had radiator lowering kits for every Yamaha since 2009 that I have owned. I don't notice much difference, although others have. But ,I was one of the first that had a 2010, and I have loved those machines all the way to 2013. Most people didn't like them, so........ The 2014 is better. I think most people read something and have to have it. Most people just need to ride. I was sponsored by DR D in 2009, but didn't renew my sponsorship to buy pipes since. I think the stock pipes make plenty of power. I have been using the same two kits since. Just take them off bikes when I sell... Just use the EFI tool to get it like you want, although you have to do research to find out what lean setting do, what rich setting do, and what spark advance and retarding do. Grayracer, I never had any trouble, but technically, 946cc is the way to go! Sorry about spreading disinformation on the 950cc!!