Headers on the 2011 GMC

[piecesparts]

I just put a set of Kooks Long tube headers with their catted 'Y' tube on the GMC SWB. There is a serious difference in performance and sound. I think that this was definitely a good install. The factory system is so inefficient in comparison.

[grayharville]

How much gains we talkin? Any problems with gasket leaks? This might be a mod ill do in the future if its worth it.
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[piecesparts]

Originally Posted by grayharville

How much gains we talkin? Any problems with gasket leaks? This might be a mod ill do in the future if its worth it.
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I have not been on a dyno with the truck for actual numbers, but the "seat of the pants" and the acceleration ability tells me that I have opened up the exhaust to allow for a more aggressive acceleration capability. The truck now makes more use of the aftermarket air intake that I put on and the two are now working together much better. It is surprising the amount of restriction the manufacturers put into these vehicles.

There are no gasket leaks and I don't there will be in the future either. The headers came with a set of aluminum gaskets for the engine ports and the lower connections are all a "ball and socket" design. All of the bolts have locknuts to maintain the tightness in them.

[grayharville]

That's good to know. Ill have to do this mod to mine later down the road. Thanks for sharing!
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[Jparks]

I just ordered a set for my 6.2 Silverado Friday, hearing good things makes me all the more anxious to put them on

[piecesparts]

Are you going to install them yourself? I have a two post oift and it made a world of difference in getting mine done. There are a few tough access bolts that you will have to deal with. I have pretty good selection of tools, but found that I needed to expand my collection some. Most nuts are metri (of course) and using a socket set to gdet at them was not always available. I now have a bigger selection of metric combination wrenches. The new design ratchet box end wrenches is now in my tool box. There were a couple bolts on the exhaust manifolds to the 'Y' pipe were hard to get access to and the rear head bolts for each of the exhaust manifolds.

[Jparks]

Yeah i'm going to be putting them on myself, my truck is lifted 8" so I have a lot of room underneath to work, may have to add some tools to my collection, which i'm considering a plus, thanks for the heads up and info