Lehner XL3100 or XL3600????

[rcjmaxx]

A friend recently was going through boxes of spare rc parts and came across 2 Lehner motors an XL3100 and XL3600,hes willing part with one but not both.My question is which would best fit my needs.I have a 10.5 lb Emaxx with HPI Phaltline onroad tires(Maxx size)this will be a strickly topspeed ride.I run 4 cell lipo with a Mamba Max,would these motors be to much for the MM? How about with the 9920? Can either motor handle 6 lipo cells? I currently run 40-41 with an 8XL,can I expect better topspeed? Thanks