The Hydromax Wide Boy is a newly designed Bathmate X30 that provides more space for girth while keeping the same amount of length. This allows you to keep working on length without hitting the sides of the pump. Unless you can fill the entire pump (length and width), Bathmate recommends that you stay with a smaller system to ensure that you have "optimum hydraulic pressure” at all times. A pump that’s too large will apparently result in less than optimum pressure (we haven’t tested this so we’ll take their word for it).
This new X30 has a larger inner diameter of 2.45” but the same length as before which supports up to 7”. Essentially, the Wide Boy X30 gives guys with a lot of girth (more than 6.28”) more room to expand sideways while working on things longways. With this pump you don’t have to make the jump to a much larger X40 which could be too large overall and result in poor performance.