Installed on my XJ in about 45 minutes including painting the fuel rail. I was skeptical but they fit great and don't cause any problems. Much better to do nothing. Slightly better bass response. If you want to upgrade, buy them.
Hy-Per Fuel Complete Gas System Cleaner By Rislone
24 Review
Lucas Oil Fuel Treatment Quart - Tan Color, 1QT Size
31 Review
Universal Fuel Tank Lock Ring Tool For Chrysler, Dodge, Ford, GM, Nissan, And Jeep Wrangler - Easy Fuel Pump Senders Removal And Install Tool
44 Review
Restore Your Diesel Engine Performance With Archoil AR6400-D Fuel System Cleaner
31 Review