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ARH is the best. Kooks is tied. But ARH is the only Header company that are not only made in the USA but the steel itself is made in the USA. All the other companies source steel from China or similar countries. ARH's are used on the COPO for a reason and money no object they're the best. Plus, between ARH and Kooks, ARH is the only one to make the long system that would connect just before the factory suit case on these ZL1's, which is what you want so you delete the secondary cats, junk factory X, and crushed rear section.
I'm not saying you can't make power and be just fine on TSP's or similar, but for me, it's ARH or Kooks, and in the case of the 6th ZL1, ARH.
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