I've got a Hustler Slingshot and I'm on the fence about lower drives and which one will perform the best on my boat. I'm running XR's. What's the advantages and disadvantages for each of the lowers? Thanks in advance.

I think the conventional wisdom is that unless you are running over 90 MPH the XR is just fine. Both the IMCO SC and the Speedmasters come into play if you are running faster than 90 MPH. The IMCO SC's have a much shorter skeg which will help with top end over the Speedmasters but you are going to give up some control/stability. I ran a 38 Fountain with Speedmasters and picked up a good 4 MPH when I switched to -2 Imcos. They handled fine in most conditions but when I was in really rough water the boat didn't seem quite as hooked up.