Overall Rating
4.4 out of 5
4.4 out of 5
Open Ratings Snapshot
Rating breakdown 20 reviews
5 Stars
11
4 Stars
6
3 Stars
3
2 Stars
0
1 Star
0
Ease of Use/Installation
4 out of 5
4 out of 5
Quality/Construction
4.5 out of 5
4.5 out of 5
17 of 20(85%)reviewers would recommend this product to a friend.
Product ReviewsWrite a review
Overall Rating
5 out of 5
5 out of 5
Great totally worth the money
June 20, 2011
Chevy4ever
Location: Colorado springs, colorado
How often do you shop at JC Whitney.com? Multiple Times a Year
"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"
Pros: They work!
Cons: Not a bad price for the product but as anyone would say wish they were cheaper
+12points
16out of 20found this review helpful.
Was this helpful?helpful16unhelpful4
Overall Rating
5 out of 5
5 out of 5
They work
March 18, 2011
Anonymous
Location: Iowa
How often do you shop at JC Whitney.com? First Time
"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."
Pros: More power and MPG
Cons: Need color variations, dont recmnd E3 plugs.
+6points
8out of 10found this review helpful.
Was this helpful?helpful8unhelpful2
Overall Rating
5 out of 5
5 out of 5
MPGs
December 19, 2009
Anonymous
Location: NJ
How often do you shop at JC Whitney.com? Multiple Times a Year
"I put these in my 1995 Jeep Cherokee Sport. Before installation I was getting 13-14MPG. Now I get 18MGP around town and have gotten 21MPG on HWY. I will put a set of these in all of my vehicles."
Pros: Easy to install, does what it says
+18points
20out of 22found this review helpful.
Was this helpful?helpful20unhelpful2
Overall Rating
4 out of 5
4 out of 5
stoped the knock
February 26, 2009
Mainer
Location: Windsor Maine
How often do you shop at JC Whitney.com? Multiple Times a Year
"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."
Pros: easy install
Cons: price
+9points
11out of 13found this review helpful.
Was this helpful?helpful11unhelpful2