These injectors are an upgrade and will increase your MPG. Warranty is issued with every set of remanufactured fuel injectors. This warranty is non-transferable. The first step is to notify us of your specific issue.
Installed these in a 250k+ mile old vehicle and gave it new life. Apparently old injectors DO wear out, as maybe I can get another 100k out of this thing! Improved performance and increased fuel mileage are main benefits. Smother running engine from idle to WOT.