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
Quality/Construction
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