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If you're talking about the plug in module and replacement lens version I have it on two bikes and they work fine. Didn't compare the temps of the bulbs before and after so I don't know anything about that.
I got the Aux kit but haven't installed it yet. I'm waiting until it gets above zero again :-(
I think I'm going to do the mod to have the turn signals only come on when turning or braking rather than have them on all the time as running lights. I got the mod from the forum at this link:
It's well worth getting. You will notice quite a differance in your mirrors at how people react behind you with the extra 2 brake lights.
Should be stock on all Harleys imo
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