Its been my experience that they run everyone together. You can't go wrong with a solid 10mm cub they r the most economical. Great power. I myself have rode a 10 cub in a stock chassislightend with a 14 over arm and ran a best of a 3.93. It had more in it with some gearing changes. Stock frame lightend up you will be a happy camper. I dont know if id be out jumping it in the dunes tho. Choose a reputable builder, Fast,Rdz,k&t,Titan,Hjr. This is to be sure they give you proper set up. Squish, fuel type,intake size. And of course who you would like to port it. And what type of porting. I myself have a 4mm cub and wish I had the coin to put a 10mm together. just my 2 cents hope its helpful