does anyone know anything about these? do they work and are they safe? are they worth the money? do you have to buy any sort of chip or does it modify the stock one? It seems like it could be kinda fun to have, if it doesnt make things blow up.
http://www.motorhaven.com/customer/home.php?cat=40
http://www.motorhaven.com/customer/home.php?cat=40