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680's were fine with the green up to 400awhp on 93 octane ~ 26psi. In hind sight I should have just gotten 1000cc injectors to begin, they would have been overkill but I wouldn't have had to buy 680, 780, 880, 1000cc during my upgrades.
If you foresee running race gas with more boost/timing on the green or if you might go bigger turbo I'd start with a bigger injector and save yourself some money/hassle in the longer run. The price between injector sizes is minuscule and with tuning the fuel economy won't change either.
Last edited by Mellon Tuning; Aug 8, 2008 at 08:19 AM.
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