Kook Headers

[ArchdukePoland]

I purchased a set of 2" x 3 1/2" Kook Headers from Lethal Performance for my 2014 GT500. When they came in, the driver side tubes were not flush because the tack weld failed. I contacted Kooks to inform them of the issue. They were very kind and told me this is typical for race cars, and assured me that it would make the installation easier, especially when having to remove the headers on a frequent basis. The four exhaust tubes converge to a collector which isn't welded together.

I consulted with two of my friends and they recommended getting the header re-tacked so that the tubes are one continuous fixed component.

I wanted to ask the SVTPerf community if anyone has had this same issue with the tack weld failing? If so, did it make the installation easier? Let me know if you think I should get the tack welds repaired or install as is.

Apologies for the large picture. I am not sure how to make it smaller.

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[OKBandit]

I'm no header specialist, but nothing about that picture looks easier to install to me. Looks like the tack failed because the header got bent to me.

 

[GT500wantabe]

If it has a good bead around the back side it should be fine. Adding weld in the inlet side might create restriction or turbulence.

 

[ArchdukePoland]

Thanks for the input guys. There was no weld on the back-side, only the top had a small bead. I will send the headers back to be repaired in the upcoming days. I was just sad to see this when I did the unboxing.

OKBandit-
What part of Oklahoma are you from?

 

[OKBandit]

I am in the Tulsa area. So are the collectors held on with springs?

 

[ArchdukePoland]

I'm not sure. The individual tubes slide into the collector and is held in place with tabs bolted up. I figured the thermal expansion provides a good seal. I'll attach a pic later tonight or tomorrow.

 

[ArchdukePoland]

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[RedNightmare06]

Just fyi what you have is their race header. If you don't want the slip collector or split flange go with their mid length one piece header.

That header you have is awesome.(Makes great power)
Yes the pipes are separate and the split flange is correct.
They are the simplest headers to install in these cars(the split design makes a world of difference)

The collectors are hold on with bolts using those tabs shown.

I do suggest some copper RTV on/in the collector pipes otherwise they will leak some.