"I have a 2001 ford ranger edge. It made absolutely no difference in gas mileage or power. My truck is in excellent shape with a cold air intake and throttle body spacer, so i have no idea what would cause these not too work."
Cons: Not a bad price for the product but as anyone would say wish they were cheaper
"Saw a difference in both HP and mpg the second I put these in got a them for my 2011 silverado and live in Colorado springs elivation 6000+ feet and put this in with a volant cold air intake and I get 36 mpg intown with all 8 cylinders going 45 with V4 shut off love these. My silverado runs like a beast with the mpg of a Honda almost"
How often do you shop at JC Whitney.com? Multiple Times a Year
Cons: Need color variations, dont recmnd E3 plugs.
"I installed on my wifes 1999 Bonneville along with Accel coil packs and OEM Delco Iridium plugs. The engine runs smoother accelerates quicker, also has a whine to it almost sounding like a SC 3.8. Mileage has improved by 2 to 3 MPG. Now getting 430+ on 1 tank, and I'm not gentle on this car."
How often do you shop at JC Whitney.com? First Time