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Your cart is empty.Every Gibson Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engine’s ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock crossover pipe. They are well suited for lowered and raised vehicles, street and off-road. 50 State Street legal. Meets EPA and CARB requirements. Will not affect the factory warranty.
Pepe T.
Reviewed in the United States on May 7, 2020
although they many not increase but maybe 5hp they fit perfect and overall sounds better, installed in a 6.2 13 cadillac
G. Flammond
Reviewed in the United States on November 14, 2020
Spot on for my 2007 Hummer H2, I love the amazon garage feature. I just plugged in the specs of my Hummer and ordered. Perfect fit. I of course had an expert install and all is good. Fantastic headers. Purchased same Headers 2 years ago for our 2004 Ford F-150. Fit perfect. Our mechanic said both were easy install.
Caesar Gonzalez Sr
Reviewed in the United States on November 14, 2020
Rust everywhere after 1 1/2 weeks of installation. Supposedly stainless steel. Plus it came with dents everywhere. NOT A GOOD PRODUCT.
Evan S.
Reviewed in the United States on October 20, 2019
Very satisfied with fit and finish. Install was pretty painless since I was changing the y-pipe at the same time.
Danny
Reviewed in the United States on October 24, 2017
let me start this off by stating that gibson really needs to be more detail with their instructions. the video they post is a complete waste of time to get you to buy the headers getting you to think it’ll be easy. i’m very mechanical but the driver side of the y-pipe was probably the biggest pain i’ve ever come across. had to have someone underneath pull the exhaust pipe out the way while i thumbed the head bolts on, then had to pry the flange end over a good 1/4 inch to slide the bolts through. slipped a gasket between the flanges and it’s still leaking for some reason. will figure that out in the next day or so.. make sure you have a good swivel for impact along with a few extensions to get around the cats. passenger side has the o2 sensor right in the way of an exhaust bolt that you can only get to with a small wrench if you forgo removing the sensor. the headers them selves feel nice and look good. my exhaust note with the flowmaster super40 has smoothed out and the drone has vanished. shifting response also feels better for some reason which i like.it’s a good show watching the pipes smoke when you hear them up for the first time. :DUPDATE: i decided to take my sierra 1500 in to a custom exhaust shop to fix the leak. they decided to cut the exhaust piping on the drivers side and add a section to relieve the tension. worked like a charm.also they cut me a deal on a magnaflow muffler for the better flow. happy with the end result. pissed about the hassle of the “direct bolt on” bs they pushed.Good luck.
Bought it
Reviewed in the United States on January 31, 2015
Get rid of the rusty stock manifolds and bolt these on! Stock manifolds were rusty and a pain to remove, if you have broken bolts! I live in the mid-west and salt was not kind to the OE manifolds. I have had these on for a couple months now, mpg didn't improve but horsepower and torque did increase. I do a lot of hauling with a 20' tri-axle trailer and noticed that my transmission shifts smoother after installing these headers... stocks were leaking bad at rear of block so Gibson upgrade is soothing to listen to as it quietly rumbles in the driveway when warming up my truck! 4 stars because I had to go to my local know how to buy the donut gasket as it was not in the box, also the flange seems to "sit" on the edge of the heat shield for the spark plugs. Welds are thorough. Gonna buy again for my other truck!
Tony Manriquez
Reviewed in the United States on June 4, 2014
Installed on 2013 Sierra 1500 with 5.3L. Subtle difference to the good compared to the factory manifolds. A bit more throatier & noticeably more responsive at highway speeds. Although, I don't think that the new headers are that discernably louder than factory.Installation was straight forward & a direct bolt on. No need to reuse factory exhaust donut. Headers have one built-in on the passenger side. Good idea to review the instructions that come with. It gets you pointed in the right direction.Gibson quality is superb by the way. Also saved $100 compared to other aftermarket parts websites. Box arrived as sealed from the factory.
Randy Weber
Reviewed in the United States on March 28, 2013
The worst part about the upgrade was getting the stock system off. But after reading reviews about bolts breaking off, I invested in a $5 can of penetrating oil and sprayed all of the bolts 1-day before starting the project. The bolts came out without a problem and the old system removed. The Gibson Headers went on easily with no obstruction or alterations needed. I recommend replacing the O2 sensors with the new headers prior to installation as this will be an issue you won't have to deal with it once the new system is installed. Gibson also suppies all new hardware with an additional donut gasket, if needed.The swap-out took about 2 hours from start to finish and the end result is fanstastic. The truck runs and sounds much better and definitely has more power. This is a high quality product that's worth the time and investment for someone wanting more performance without sacrificing fuel economy. HIGHLY recommended!
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