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Originally Posted by satxrider
Thanks for the help and suggestions. I spent the day putting it all in. Some observations. Kooks appears to be a very high quality product. This fit was right on. They included locking header bolts by Stage 8. I went with the full system. Stepped LT headers, HF cats, 3 inch pipes and Kooks racing muffler. The sound is great, even better than the muffler delete with the stock manifold. The tone is deeper than the Borla Atak muffler, maybe it's due to the bigger pipes (3 vs 2.5). Now I'm off to get a dyno tune next week and see what gains I get. My baseline was 383 at the wheels.
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Kooks is very high quality. Pipe diameter does have an impact but the ATAK mufflers are acoustically tuned as well. They are pretty complex mufflers.