The cats will help kill a lot of smell and barely affect HP/TQ and sound. Once you go with the LTs the car will be way loud. The way I described it is the 20 y/o me loved it but the 40 y/o me went out and put the resonated X in to replace the H pipe. Still loud just not obnoxious.
If you're set on the TSP headers you're not making a bad decision but personally I went Afe (formerly Pfadt) and I really like them. The tuner was pleased with the extra TQ they made.
They're all an improvement over the stock manifolds.
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