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It's a different design that's not susceptible to being eaten away by the ethanol. You need to flash the ECU and at least get the fuel rail adapter kit, or you can get the 300 degree fuel rail, but its not required. You also have to slightly grind the plenum near #1. The adapter kit and grinding is going to be required regardless of which size you go to as you upgrade to the new style injectors. [ http://conceptzperformance.com/Cart/description.php?II=7731&Car_Type=300&UID=20131025104629130.164.62.240 ] I was told it shouldn't affect gas mileage. Mine had terrible mileage with 555CCs and now with 740CCs, so I haven't seen a change (still working on figuring that out).
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