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For wire corrosion: vinegar. Seriously. Just pour some vinegar in a cup, dunk the connector for a while, it'll come out looking brand new!

300hp *might* be able to be made out of a stock turbo, but how far off the efficiency map are you? How hard are you having to try and spin that poor thing? I think honestly the physical limits of the...

You need the bigger ports (even 16V) to take advantage of the extra amount of stroke. Yes, even with boost. I do agree that the tune will also have an effect on things as well as ignition timing is...