Headers on the 2011 GMC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

piecesparts · 10-29-2011, 10:29 PM

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. I would have taken pics, but was running out of time.

**LEEVON** · 11-06-2011, 10:38 PM

I hear Kooks are high quality. How much were they? How was the install and did you get a tune after?

piecesparts · 11-07-2011, 03:06 PM

The KOOKs did cost more than some other brands, but I went through a dealer off of another website and they were running a sale on them, and kicked in Jet Hot coating on them. The cost of the set was around $1100.00 for everything, (including the catted "Y" pipe, gaskets, and delivery ) The install is supposed to take 3 to 4 hours, but I took a little longer, due to one of the O2 sensors not wanting to play well and the tight quarters for a couple of the nuts/bolts on the factory exhaust. Once everything was off, the install was smooth and easy. Just make sure that your headers and the "Y" pipe components are positioned away from any frame contact points---this will send a spark knock retard signal back to the computer.

I already had a tune and it was real close to what we needed with the headers and now the truck runs quite well.

10-29-2011, 10:29 PM	#1
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Headers on the 2011 GMC 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. I would have taken pics, but was running out of time. __________________ Frank

11-06-2011, 10:38 PM	#2
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,888	Re: Headers on the 2011 GMC I hear Kooks are high quality. How much were they? How was the install and did you get a tune after? __________________ '20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

11-07-2011, 03:06 PM	#3
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Headers on the 2011 GMC The KOOKs did cost more than some other brands, but I went through a dealer off of another website and they were running a sale on them, and kicked in Jet Hot coating on them. The cost of the set was around $1100.00 for everything, (including the catted "Y" pipe, gaskets, and delivery ) The install is supposed to take 3 to 4 hours, but I took a little longer, due to one of the O2 sensors not wanting to play well and the tight quarters for a couple of the nuts/bolts on the factory exhaust. Once everything was off, the install was smooth and easy. Just make sure that your headers and the "Y" pipe components are positioned away from any frame contact points---this will send a spark knock retard signal back to the computer. I already had a tune and it was real close to what we needed with the headers and now the truck runs quite well. __________________ Frank

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