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The LS3 exhaust and L99 exhaust are different in two ways. The LS3 has free flowing mufflers and smaller resonators. The LS9 has a huge resonator can and a more restrictive muffler. The LLT cars are a mix of the two, lol. We have the more restrictive cans with the smaller resonators. The v6 cat back looks like the LS3, whereas the L99 looks way different in the resonator area.
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