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Reduce in-cab drone in your existing 4" aftermarket exhaust system with this replacement downpipe from Diamond Eye for your Duramax. Specifically designed to reduce drone in the cab of your LB7 Duramax, this is the same resonator used in many of Diamond Eye's complete turbo direct pipe back exhaust systems. This resonated downpipe will bolt up directly to your turbo direct pipe and will mount to an existing 4" aftermarket exhaust system.
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