Just purchased a nice 2013 LTZ 400. It's in great condition but it's bone stock and I want to make it my own maybe someday, with practice I maybe can run in a couple of senior amateur GNCC types of races in the future. The problem I'm encountering is I have been looking to do the build from bolt on modifications to wheels and exhaust, power tuner, air box, etc and I was wondering can I also look at past years up to 2009 for a better selection of aftermarket parts. Does an airbox from 2010 fit on my 2013??? That's my question. Is there a website devoted to builds and questions like this one. I just am under pressure to get parts for my mechanic so I can get the quad ready for a big trip in August. Any help will be greatly appreciated.