I had one of these on my 2003 Silverado 5.3 and could tell a difference in the low rpm range with added torque. I bought it for my Silverado 5.3 from 2014 and I don't see any difference, not one bit. I know some people who swear by it and it worked on my old truck but not on this one. That's why I gave at least 3 stars because I know they work but not for my app.
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