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Yea, what Ted said is true! The high flow cats will give you that extra flow volume both for performance and sound! The stock cats are THE biggest flow resistance in the exhaust! Adding LT's won't do much for additional sound but will add some more performance! Downside of LT's is that you will eventually get a cel light due to O2 sensors are in a different place relative to the engine. A tune will eliminate the cel and maximize performance but will void the powertrain warranty! I have Solo high flow cats and cat back exhaust and it's quite loud and no tune required! I added some high flow resonators to quiet it down a bit and I think it's perfect now! So if you don't want to worry about voiding warranty but want more sound and performance, the high flow cats will be the way to go! IMO!
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