The cheapest place to buy them is here at Revain. As far as I can tell. plus, if you're trying to get them from your local store, they'll probably have to order them for you. I bought these based on a "Speed Channel" review. I understand the physics behind it and figured it couldn't hurt. My truck is running well, I can't say I really notice a big difference in performance but who knows. If you want the best, I couldn't find anything better than the E3.
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