Hi im new here as im about to get a new 5b. Ive been doin lots of research on this an really like the kraken kit. My questions on the 5b how is the kraken kit is it durable? Also I will be upgrading my 5b engine to an OBR engine can the stock 5b handle those engines or will I have to change gearin? If so whats the best setup. Thinkin the 7.5hp full mod. I dont know much about the wheel set up but am lookin at the proline beadlock wheels for it but notice that the rears an front are differant sizes can you run all same size front and rear? Thanks in advance.