(IMHO) I have used "the little rabbit pellets" in older cars and the occasional farm tractor with mixed success. On one hand, the stuff did stop the leak. The exception was that it eventually clogged up the radiator, heater cores and controls on occasion. Granted, the cooling systems were old and probably marginally mucked up in the first place. Hopefully, most Viper cooling systems are not this deteriorated, but, this kind of repair reminds me of Fix-a-Flat. Cost effective & covenant in the short term, but inevitably expensive in the long run. Most these products are only a band-aid fix. Would you want to run the risk of gumming up a already overworked cooling system or heater control by using this stuff in your Viper? On the other hand, the car will inevitably land in the shop for the head gasket anyway. They can fix the other stuff that gets mucked up then as well!! Frankly, if manufacturers used the stuff in the cars coming off the assembly line, it would indicate to me there was a inexcusable problem to start with. Just my 2 bits...