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Water meth Small nozzle ?

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Hello im new to wmi and I have a question.

I have a snow performance stage 2 and I will use it on my 1.8L turbo engine. I have now 225hp(11psi) but I see people with 400hp on similar setup with more boost(22psi) and 99 octane gas. Where I live we only have 91 octane. I would like to inject the minimum quantity of water meth as possible so I don't use much and it will not make my car to lean if it stop working.

?What size nozzle I need to have equivalent of 99 octane? and is it ok to do it like this ? Thank you for your help

-I will use 50/50 vp speed sauce.

-Snow performance tell me to use #6jet

From installation manual...

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Where did you find this manual. I only find the new style nozzle holder manual. And if I check with the new jet size diagram I need a number 6.

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