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I was in the exact same predicament as you. After much research, I noticed that the BBK sound deeper than OBX. This is probably due to the cats but no one really knows. Also, it depends what exhaust your pairing it with. I currently have borla proxs mufflers and asked a person with bbk's and borla proxs mufflers as well how his sounded and he said his sounded better than his currently stock ss. The obx are a little raspier which can be tamed with a resonated x-pipe. It depends what your going for really. As far as the gains, they are all about the same.
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