The MMP will take almost ANYTHING you can throw at it...
I have a 5.5 turn motor in my ZX5 & I can get the fan to come on some times.
I have a 8.5 in my SCT & I don't think the fan works any more.
I also have a 10.5 with no fan in my RB5 & it gets warm.
Unless it is some really "odd" 13.5 the MMP will have no issues & be putting very little stress on the MMP.