in the uk gt12 is a lower spec car than a lmp as in its a one piece chassis front to back with a pod on top, lmp is full blown pan car,
some outside the uk use lmp car and gt bodies, so check your area, supsastox is a model name of gt12 so schumacher made ths supastox, supastox gt and then the atom.
if you want some more info and have face book look gt12 circuit uk, lmp circuit uk
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oh the downside............. its adictive and fun