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On amazon reviews most people seem to like the prodct. But once you weed out the “whoow it is great reviews. There are a couple of people that claim 1-2 mpg gain. One claims a %3 improvement in fuel economy. Some say their car is quiet now. A few claim the engine has been restored and stopped smoking and oil pressure was up. Quite a few say it did nothing and one guy says his car does not run anymore.
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