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I think the cat back would be the way to go since you are wanting perfomance increase. The axle back is just gonna be for looks, and I don't know for sure on all brands, but probably won't sound the same as the cat. But you will probably still run into drone though. Supposedly Corsa makes a cat back that eliminates drone but I've only heard it on recording. I'm with you, I think the Borla sounds awesome!
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