New 2024-2026 Duramax Monster Exhaust: True 5″
The world’s only true 5″ DPF-back exhaust is now available!
Gale explains how we did it
Watch Gale Banks explain how we accomplished something that no other exhaust manufacturer could. We decreased exhaust backpressure without triggering a check engine light.
What Monster Exhaust does
The Banks Monster Exhaust (Part #48910) includes 5-inch constant-diameter tubing, SideKick ob-round tip, and the patented Exhaust Pressure Module.By reducing exhaust backpressure after the DPF, the system liberates otherwise lost horsepower and fuel efficiency.
You’ll get:
- Improved fuel economy
- Quicker throttle response
- Protection from melting your trailer
- Massive, great looking exhuast tip
- Patented module that enables airflow improvements
No more melted trailers!
The factory Duramax “trumpet” or dual-walled venturi tip is widely disliked for its appearance. Worse, it points straight backward, which directs active DPF regeneration heat right at your trailer.
The Monster Exhaust is aimed out to the side of the truck. This allows ambient air to diffuse the heated gas, eliminating the risk of melting a trailer.
Why did it take so long?
Because no one had ever done it before.
In 2024, GM added additional emission-related checks for the exhaust system, measuring the DPF’s pressure differential. When exhaust back pressure is reduced after the DPF, such as with a 5″ exhaust, the engine control module thinks the DPF is over-full with soot, sets a check engine light, and reduces engine power. Meanwhile the DPF may actually be empty and free-flowing.
To overcome this obstacle, we engineered the patented Banks Exhaust Pressure Module (shown in photo below), which installs in-line with the DPF delta pressure sensor. The module recalibrates the sensor signal, then sends it to the ECM. This corrected signal permits significantly improved exhaust flow.
Made in the USA
Banks Monster Exhaust Systems and patented Exhaust Pressure Modules are engineered and manufactured in the USA.
Ending Pumping Loss: Why Electronics Are the Key to Modern Diesel Exhaust
In modern emission-controlled diesel engines, reducing exhaust restriction is no longer just a mechanical plumbing problem—it is an electronics challenge. When an engine has to force exhaust gas through a narrow 2.85-inch factory tailpipe, the pistons must work harder on every exhaust stroke. This creates parasitic “pumping loss,” which wastes engine horsepower, reduces fuel economy, and drives up thermal loads. Upgrading to a 5-inch mandrel-bent system provides a 192% increase in flow area, drastically reducing turbine backpressure and liberating usable power.
However, modern ECM logic interprets this free-flowing exhaust as an anomaly. By measuring pressure drop across the DPF, the factory system assumes a lack of downstream backpressure means the filter is loaded with soot, triggering limp mode. The patented Banks Exhaust Pressure Module (U.S. Patent 12,618,353) bridges this gap. By conditioning and scaling the differential pressure signal before it reaches the factory ECM, Banks allows your truck to breathe without setting diagnostic trouble codes.
Combined with the SideKick side-exit geometry that eliminates 1,200°F DPF regeneration blasts against towed trailers, the Banks Monster Exhaust delivers genuine performance improvements while protecting your expensive cargo. Proudly engineered and mandrel-bent in Azusa, California, it represents the standard for 2024–2026 Duramax exhaust upgrades.
Related Duramax Exhaust & Performance Articles
- 5” Monster Exhaust for 2020–2021 Chevy/GMC 6.6L Duramax — Explore the aerodynamic SideKick tip design that reduces backpressure by 85% and eliminates trailer heat damage.
- 2024 Duramax Development — Go behind the scenes on how GM’s tight sensor tolerances led Banks to engineer patented electronic control modules.
- Top‑Notch Ram‑Air Intake Design for 2024 Duramax Truck — Discover how pairing the Monster Exhaust with the Banks Ram-Air intake optimizes total induction and exhaust pumping efficiency.
- 2024–25 Duramax Derringer Tuner Upgrade — Learn how the Derringer tuner unlocks dyno-proven power while seamlessly integrating with the 2024+ ECM.