Installed a kit in my Tacoma a few months ago. It is not known how long he will live, but theoretically 100,000 should happen. Noticed slightly better gas mileage (between 0.75 and 1mpg - yes I check the mpg every time I fill up) and slightly smoother under hard acceleration. Say well done. Yes, I noticed that the left and right banks have different plugs from the factory.
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