Those ports look like someone got carried away with a dermal tool, my cylinder is professionally ported by one of the best blaster builders out there, its an aggressive trail port an my intake side isnt opened up that big, but mine has boyesen ports also, but to me it looks like the velocity through that intake tract would be greatly hindered, the total size of the exhaust port dont really mean much, its the timing of the ports that really matters, an without bolting a degree wheel on it an a dial indicator youll never know were its at