have no idea, but coasting from missing fourth and still hitting 13.5 seems, well weird. you're only option, not miss 4th and see what you run....
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2009 370z Touring 7AT/AAM 2.5 true dual exhaust/AAM DE test pipes/z1 vqde35 headers/AAM cold air intake (R-line)/Motordyne M370/Quaife LSD/z1 brake upgd pkg/Swift Spec-R springs/WhiteLine Front&Rear sway bars with endlinks
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