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From: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
not sure that you need any... think there may be a gasket on the box? ordered mine and they are in a the dealer.. they are approx 30, but I get a discount at subaru so couldnt give an exact price..
Ill let you know what I get when I pick it up, as I said order everything I need.