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I used the 6510 at .32 and it is working perfect so far. Idle doesn't stumble anymore than stock. Whipple called for the 5107 but I already ordered the 6510 and just used them. Are you still on the stock plugs?
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2016 2SS, A8, Whipple 3.25 pulley, Mishimoto catch can, C7 Carbon fiber splitter and skirts, GM black brake and tail lights. PLX wideband O2/HP tuners. Apex VS-5RS in 19x11 and 19x12.
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