subaru sport timing belt?

Y reg, impreza 2 ltr sport, SOHC, non turbo, 4wd, 67000k
T belt needs to be replaced, can anyone confirm if this is a freewheeling engine and not an interference engine. My autodata T belt book says a variant of this engine is freewheeling but only lists engines up to 1999. I think engine code is GD.
Regards
RM, November 2013


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