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Dieselr 4" aluminized cat back single for 2011–2015 GM 6.6L Duramax — clean fit, strong flow, and long-lasting aluminized steel build.
Custom fitments
Tell us about your platform, performance goals, and timeline. We’ll map the parts, confirm availability, and send back a detailed quote with next steps.
Custom fitment brief
Outline your vehicle, performance targets, and timeline. The build desk will confirm availability, pricing, and next steps in writing.
Get the DIESELR EFI Live Transmission Tune File (2019–2024 Cummins 6.7L AISIN). Improve shifts, towing power, throttle response, and reliability.
DIESELR EFI Live Transmission Tune File (2013–2018 Cummins 6.7L AISIN). Improve shifts, throttle response, towing performance, and drivability.
Motor Vehicle Exhaust