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Replace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance. Greater Heat Retention. 20% Greater Flow Over Stock. Richer Diesel Sound. Will not Affect Emissions (DPF system or the Urea injection system). Gains of +21 HP and +24 lb./ft. Torque. Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction. Ensure that the intended use of this product is permitted. Not for sale or use in the state of California.