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Can't answer that specific question since I've never ran Kooks but wife bought me a set of TSP headers. They look good and end of February I'll have them installed and tuned then give you a better impression.
I have bought and installed both ARH and Kooks, and like kooks better. I have never had TSP headers, i did have there True duals back in the day though. (Fbody stuff)
wife just bought me a set of tsp 1 7/8 and catted x pipe. I plan on installing them in a week or 2. waiting on the b&b exhaust to show. the exhaust manifold studs arrived today
Main reason for the price difference is because TSPs are made in China and Kooks are made in USA. With that said, I haven't heard of any issues with the TSPs. I went with Kooks on my C7 because I was well pleased with them when I installed them in my old Pontiac G8 GT.