Series of videos having some fun in a water meth injected Mazdaspeed turbo.
water meth kits aren't too pricey or new. methanol can be had for fairly cheap & even available over the counter. i helped my buddy dial-in his meth kit in his mk5 gti 2.0t. depending on your mixture ratio you can cool charge temps less than ambient & bump up your octane. fun stuff, but i wouldn't want to run it on my daily as introduces another potential point of failure.
FM intake $250 new.