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The difference is the ls3 system has an X pipe and the L99 is a resonated h chamber. Yes, it will fit.
I had the X pipe and toned it down some by replacing the midsection with the resonated h.
When I talked to MBRP they told me that is the only difference between the two catback systems.
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Another 1 of 371 '12 T3 LS3 M6's built.
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