If it's the type that starts below the O2 housing (hopefully) then you don't need t replace the donut gasket. The one at the downstream end of the downpipe does need to be replaced though.
I'm not sure how necessary a Walbro is on stock fuel and stock turbo. You'd probably be okay, but then again a fuel pump is good insurance. See what the techies on Evom.net think.
As far as I know, an MBC is fine on the Evo, because it doesn't have the PTFB lean condition issues Subaru does.
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FWD is the new AWD
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