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If you are using meth for fueling and tuning for it with no safeguards like a pop off valve to dump boost, you want the best system you can find. One company makes expensive throttle bodies drilled for meth nozzles so you get direct port injection. Can’t remember the name but you can find it if you search. But any tuner who tunes for you won’t take responsibility if you blow up the motor.
Aquamist makes nice stuff. It is what I use though not on a supercharged E9xM3. You can buy direct port manifolds and other parts from the English side of the company. Not sure Howerton, their US distributor, sells that piece.
I would not trust my S65 on boost to a couple of nozzles spraying into the air filter or intake pipe. Dispersion might not be good enough. Fine for supplemental cooling or octane safety but not if the tune depends on them.
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