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#3: 08-18-2013, 09:58 PM
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Who told you it runs lean? The cobb maps are generally pretty rich. The reason people use the 91 map while pumping 93 is because of knock. The 2 gap in octane gives a safety margin.

11.1 isn't rich, and the O2 sensor won't read below that at WOT anyway so you have no idea how rich you're actually going without a WB.