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J&S Electronics knock sensing ignition retard. Anyone have any expierience?
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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff.
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