i've had experiance with tilton twin disc BUT not in a t45, but i can tell you they are well worth it....but when you say 600HP, you talkin high or low 600's?
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RIP Kevin Gonzales AKA Slo_Si 9/06
RIP Robert Kolp aka 00ek 4/07
RIP Pablo Garcia aka FatHead 9/07
_Jake D