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1 set used Xied $55
I ran these on my '09 FXD for about 8K miles while saving for the Thundermax Autotune. They did exactly what Nightrider claimed. Cooled my factory hot running motor down by enriching the AFR. worked fine with my slipons mufflers and SE air cleaner.
Simple to install just plug them into the wires from the o2 sensors and go.
Check fitment for your bike at http://sales.nightrider.com/XiEDtm_p_8.html
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