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I was just wondering when you have a modded TT how do you know what type of injectors to get the 550cc or the 850cc Injectors? What determines the type someone should get?
 

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There is no exact formula, but 555cc injectors are good for most "mild" turbo and intercooler upgrades like Sport 500s, 530BBs, etc. If your pushing a lot more air with big turbos you need to jump to the 740cc or 850cc injectors. The 850cc ones are for the monsters.
 

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Actually there is a formula for calculating what injector size you need. You can go here to figure out what size would fit your needs best. Keep in mind that going too large will effect how stable your idle will be, so unless you honestly need more, then don't go overboard. In most cases the 555's will work just great.
 
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