This product is currently on backorder, with an ETA of the end of March. Click here for an alternative option. Fits 2017 - 2023 GMC vehicles with the L5P 6.6L Duramax engine. Note: Custom Tuning Required. Elevate your L5P Duramax with our enhanced 3.5' downpipe. Say goodbye to the restrictive stock downpipe that raises EGTs and reduces power. Part Number: L5P - EXH - A004. Features include a 3.5' downpipe made of full stainless steel, a high - quality heat wrap kit, replacement of the restrictive 'crushed' OE downpipe and cat, connection to the factory turbo outlet, compatibility with any aftermarket race exhaust system or OEM system, and a 4 - bolt flange. This downpipe is for off - road competition use only as it does not include bungs for sensors. We recommend adding the EGR Upgrade Kit to fix potential OEM EGR issues.

Using this 3.5' L5P downpipe is a great way to enhance your vehicle's performance. First, make sure your vehicle is a 2017 - 2023 GMC with the L5P 6.6L Duramax engine as it's specifically designed for these models. Remember, custom tuning is required before installation. When installing, connect it to the factory turbo outlet. It works well with both aftermarket race exhaust systems and the OEM system. Since it doesn't have bungs for sensors, it's only for off - road competition use. As for maintenance, keep the stainless - steel downpipe clean. You can use a mild soap and water solution to clean it periodically. Also, we suggest adding the EGR Upgrade Kit as it can help prevent potential problems with your OEM EGR system, saving you money in the long run.