my brother bought a xx and he wants to change the wheels to regular sizes, what size would i need, what size of itp bajas would i need, and what kind of tires are good for all around, trails, fields, gravel, i was thinking razrs or what, what skids should he get, also he will be wanting exhaust and a programmer, will he need a programer, if he does what kind should i get and what kind of exhaust should he get, thanks guys, i rode this beast and its amazing...