If you don't tune with meth in mind you'll likely run into trim issues, but the charge air benefits will still be realized and you'll have more headroom on the octane side.
Why would you spray 20% meth? Just curious. If fire is a concern, run boost juice at 49% methanol.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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