There are gains with meth on the N55, typically 35WHP for N55. I recommend downpipes prior though which the OP seems to have already. Meth is a great power adder because it cools the intake charge as well as increases octane. This process cools the combustion, offering lowering EGT's. All of these pro's make the engine happy overall to make the power. You made a good choice in wanting store the methanol in the trunk. Let me know if you need any other help.
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