Not sure about the cats and the sound, but about the ground wires. I am not all to sure, but I want to say Neal has installed them. I don't really think they increase HP any, but Neal said that he can tell the difference in throttle response, since the throttle is electronic. As for the K&N, I would go with the pop charger. I have those mods, and between the K&N and Pop charger, the Pop seems to bring the tube and spacer together better. The pop charger is louder though, but if you don't drive it hard, then the wife will never know the difference.
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