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
"99 Silverado 5.3 ltr 99,000 miles, no fault codes, started kicking/bucking under loads after warm up and computer went into open loop operation. Changed plugs no help. Cleaned air intake, filter, airflow sensor, ran seafoam - no change. After installing new wires everything cleared up, although I see no increase in mileage."
How often do you shop at JC Whitney.com? Multiple Times a Year