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
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
By Chevy4ever
from Colorado springs, colorado
Pros: They 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
16 of 20 people found this review helpful.
Overall Rating
5 out of 5
5 out of 5
They work
March 18, 2011
By Anonymous
from Iowa
Pros: More power and MPG
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
8 of 10 people found this review helpful.
Overall Rating
5 out of 5
5 out of 5
MPGs
December 19, 2009
By Anonymous
from NJ
Pros: Easy to install, does what it says
"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."
How often do you shop at JC Whitney.com? Multiple Times a Year
20 of 22 people found this review helpful.
Overall Rating
4 out of 5
4 out of 5
stoped the knock
February 26, 2009
By Mainer
from Windsor Maine
Pros: easy install
Cons: price
"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
11 of 13 people found this review helpful.