Well, the Webra-50GT (Is there a 51?) is MUCH stronger than the Magnum/OS/TT-46 and is the lightest engine in that class except for the old Fox-50
I had a Patriot that I got used wiht an ASP-46 on it (Same as Magnum) and I noticed a big difference when I switched to an Irvine-53, then a big difference flying with a Webra-50GT then finally a Jett-50, which is in my opinion the pinnacle in that class-
The magnum-52 is hit and miss from what I have seen- great customer support though--- I would not bother with one...
Jett-50
YS-45 Piped
West-50
Webra-50GT
OS-50SX
Rossi-45/53
MVVS-49
K&B-48
In that order!
ENjoy