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The exhaust won't matter much with the turbo setup. The turbo itself kills a lot of the sound volume so you would probably have no problem passing with the turbo installed. But if you need to pass before installing the turbo, the the LM II muffler will probably be your best bet. It's a true muffler with silencing material compared to the LM I which is just an echo chamber.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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