Bill,
I agree with Razor.I run 2 46fx's hard and 2GMS's hard.They are run on Combat Spads and Spad3d's.they are crashed regulary in sand .The GMS's dont come close in reliability.I have 4 and 5 years on the OS's and 1 and 2 years on the Gms's.I just retired the last GMS yesterday.I dont much care what the liner is made of as long as it runs fine.Magnum XLS46 may be a fine engine but if you think Gms and Asp are better than an OS I would have to strongly disagree.