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You could port your head yourself but what if you screw it up?
I would bring it to a speed shop or maybe even a garage to get that done. (Preferrably a speed shop)
You can plane it while your at it.
Can't tell you how much hp added though. My guess: 5 hp with planing but I'm not a professional.
Happy trails.
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Some people are alive simply because it is illegal to kill them.
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