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Seen the marketing hype before. Haven't seen any postings from real P-car car owners who used one.
Given the difficulty proving that something like this actually works, few of the creators of such products have proven the validity of their claims with enough cars driven for enough miles over enough years to have any statistical validity.
There are a few kits where enough users have had enough installed on their cars for enough time that you can get a feel about how they will work. You'd be better off sticking with those I'd think.
Lots depends on the condition of your engine before installation and the skill of the installer.
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