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I use the stuff in my 2001 Z06 Vette and like it. It leaves a red/brown residue on the plugs, but does eliminate detonation. A guy on Corvette Forum did an independent lab octane test on California unleaded and it does what Torco claims. I have heard rumors that is has a high concentration of MMT, but have no idea what that is or if it is badd for your engine.

My .02
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