make one, get a led set up and then hook them up to your main power source with a good resistor, what type of r/c car...electric, or gas? p.s. muahahahaha
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OK, iv'e done this myself, all you need to do is drill some holes on the base, and glue some led's , then wire them to the battery, or motor controls so it goes i=on when you want it to. It works great, but it will lower the battery life. It's a lot cheaper though.
Real automotive underglow uses CCL's (Cold Cathode Lamp). They are basically the same thing as the light source in a flatbed scanner. However these require an inverter to supply the proper current to the lamps. This is all in all too bulky to fit in an RC car.A quick google search netted me this place: http://www.rctech.net/forum/r-c-items-sale-trade/270649-1-18-scale-underglow-led-kits.htmlThe guy that started that forum thread makes kits for sale and from looking at the kit itself, it seems its a simple LED circuit with some short lengths of acrylic rod/tube to diffuse the light from the LEDs.