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Anybody have experience/results of adding a K&N air filter to their Northstar? If so, please share!

Alright, I am wanting to mod my CTS, just a little bit. The first item I was considering (although now I am thinking rader/laser detector :p was a dual exhaust for my '03. I asked the dealer and he said "Yeah, its stainless and dual and has Quad Exhaust tips, just like on the DeVille and...