Installed by myself, drove it for a while, found my truck was misfiring. An ASE certified mechanic said they didn't match the factory setting and weren't making good contact with the spark plugs. I know it's definitely past the point of no going back, but a refund would still be nice considering the product was supposed to work effectively with my 2000 Chevy Silverado 5.3, but it doesn't. This explains the drop in performance I've noticed over the past few months.
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