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iTrader: (1)

Has anyone ever tried Shogun™ Import Performance Fuel Additives? I got something from them in the mail, and i was wondering if it is worth my money, or is it just a get rich quick scheme (liek that tornado air intake thing) and wouuld it ruin my engine? Just looking for some CL opinions.

Link: http://www.shogunperformance.com/products.htm