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Well, you've got the cost of the high-intensity LEDs, which isn't bad in bulk if you buy them somewhere online.
Then you need some sort of electronic switching mechanism (at least a couple of transistors) to switch between bright and not-so bright modes for each bank (front / back).
I imagine of the 4 pins, there's power, ground, brake signal, and go signal (for the headlights).
Gotta be some resistors in there so the LEDs don't fry, and another set for bright vs not-so-bright mode.
Thing is, when you get all that stuff together, you might be able to do it cheaper, but what about shipping? You'd have to ship in a padded envelope at least, which costs more than your standard rates (figure at least a dollar).
So in the end, it's a lot of effort for something just barely cheaper than the $6 that radio shack charges (by far the best commercial xmod mod for the money I think).
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pbmax
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