All depends on your budget and standards.
Kooks, Stainless Works, ARH are your best quality but come at a cost premium.
I went with Texas Speed. Less than half the cost of the above, and the quality is good. Had a few little fitment issues, but they were easy to resolve. I have seen similar issues with Kooks and ARH, but have no first hand experience.
I like that Kooks and ARH have non slip connection pieces for the LT to the Y. I don't have leaks, but I like knowing that when you bolt something you have it in the right spot. With slip connection, you have margin for error.
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