dunno about retrimming the seats etc,
but with repainting the plastics, the key is in the preperation of the surface. Make sure it is cleaned and preped properly. Make sure u use a paint that can withstand a fair wack of heat. You dont want them to crack and peel in the summer months.

There was an aritcle on colour coding the interior parts of your car in a previous editon of autosalon magazine. im pretty sure i have the issue at home, i'll try scan it and post it up if i get a chance.

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Evolution 8 MR

Forester GT