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im guessing at this.im sure someone with knowledge will help.... i think upgrading your injectors with a stock car isnt going to do anything......your computer is tuned to allow only so much fuel....so unless you upgrade your computer or get something that allows you to adjust the fuel flow its not worth it
Unless you buy stage II then no. But if you wanted say RC750ccs then you'd have to grab an SAFC style unit to control the fuel or the car wont run right at all.