Hello -
I got one from ebay for about $24 but never installed it. Here is a Cadillac version for bucko bucks :
http://www.intakeone.com/Denso/SunHVSeco.htm
It's from Japan, so it's got to be fuel efficient, right?!?!?!?
I showed my cheapy version to my Electrical Engineer co-worker and he said it was probably just a big fat car-sized capacitor.
The instructions warned me that if I didn't get the positive/negative right, it could burn out my electrical system. Not fun.
I will put it on at a later time, but not right now.
CarloSW2