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i was approached today by a guy who parked next to me in a supermarket and was tying to sell the idea to me of system 4 fuel catlyst. which basically is some  metal beads in the fuel system which is meant to make it run better by incrasing octane to 99 and get a guranteed  perforance increase of 20% if dizzy was adjusted. i listened for ages and then politely left, with his leaflets in hand. its endorsed by micheal winner so it must be good! but really i'm not that interested.