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I can't speak with certainty about the torque but removing the resonators usually has no effect on torque since they are a straight through design. It's mainly added by BMW for sound. I personally think resonators make exhausts sound more tuned.... not so cheap sounding. I would recommend against it. Have you considered headers? It would help with performance and definitely make things louder. Also, if you already were considering headers in the future you might regret removing the resonators since they tame down the header noise.
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