So I am planning my next build and have yet to purchase anything or really become set in stone on what I want. I do know what I want it for though, I want to build a bike that is only to be ridden on the sand and I want it to have massive power. Originally I was thinking that a 330 would be a great engine for this because it is powerful, yet rideable and much more reliable. However, I do start to drool when I hear a stroked out 431 puma start up. I have done a lot of reading about both setups on here and I have learned a lot but at this point I am still usure. I would definitely prefer to have the puma, because like I said it is the "king dingaling" of sand riding. I am not going to build it for drag purposes but rather for ripping around. I do like to go fast though and no matter what anyone says there is no way any quad can shred the sand like my CRF450, the point being I don't care if it is "hard to hang on". I guess the reason for posting this is I would like some input from current puma owners as well as people who had one and no longer do. Is it the kind of engine that you can take to the sand, and be confident it won't breakdown on you? I am a nit pick about details with my bikes so care and regular maintenance is not an issue, nor is taking the time to do things right the first time. For those who own/owned a puma, where did you buy it? Who built it? If it was not for drag purposes, what sorts of things did you have to take into account when deciding the components for it? Finally, if you could do it all over again, what would you do differently? Thanks for the help guys, this will be a big investment for me so I want to get the right parts and do it right the first time.