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if you change injectors you will need a tune. Why? because the computer will tell the injector to open at 50% when 50% open on a 370 is a lot different than 50% on a 550. i'm no engine expert though. and also, i don't see why 370cc should be bad with a t70? Won't the 370cc injector only LIMIT the amount of power it will put down?. And also, if its a good tune it should be fine. as long as you don't change anything you won't need a retune... IE sell the t70 and go to a t28. You'll def need another tune for that.
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