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I've never heard of that, do you have a source? All they do is attach a sensor to the spark plug wires, and get it up to whatever engine speed to smog computer tells 'em to, then hold it there give or take. Doesn't matter if my truck has little 12" tires or big old mudders, they'll get it to whatever engine speed the computer says to.
Last edited by roflwaffle; 11-21-2009 at 02:06 AM..
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