2017-2022 Chevrolet/GMC 6.6L L5P Duramax Diesel 3.5" Exhaust Pipe Downpipe GenericProduct Overview 1. The downpipe channels exhaust gases from the turbine housing into the exhaust system. Aftermarket versions typically offer a larger diameter and may include a high flow catalytic converter or no converter at all. 2. Replacing the factory downpipe with a high flow unit improves exhaust gas flow, allowing the turbocharger to operate more efficiently and produce more power. Removing factory restrictions also enables higher boost
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