john, i reckon there is not much weight difference in seats... i got full spec c interior at the moment.. and the sti set in the shed.. they both feel about same weight.. the spec c rear back seat would be a tad light cos there is no arm rest to fold down around 200gm for the mechanism??..

MSR- do you take out the spare wheel, jack etc b4 u go out on a run and does motorplex ask you to do that still?

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MY00 GT Forester with STi goodies