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i ran 740cc on my last set up. going to run 550s on a stock turbo with a z32 maf, just as an upgrade, until i go bigger with the turbo. but i picked up six deastchwerk 550 injectors for 250 shipped, if i was to go to like 740s i would almost get them for free with the core exchange of six injectors at 50 bucks a pop. so it can be worth it to run 550s
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