IDI 304SS Pro Series 6" Drop Back Downpipe Kit in 4" Diameter

IDI Pro Series 304 Stainless Steel Exhaust Downpipes

Precision formed. Built for the long haul.

Induction Diesel Industries brings a new level of craftsmanship to heavy-duty truck exhaust. Our Pro Series downpipes combine premium 304 stainless steel, precision CNC mandrel bending, and an integrally formed 5-inch Marman flange in a continuous, one-piece design.

The pipe body and Marman flange are formed from the same piece of tubing, eliminating welded joints between pipe sections and the need for a separately welded flange. This construction creates a smooth, continuous exhaust passage with fewer fabricated joints in an area exposed to heat, vibration, and demanding operating conditions.

Precision CNC mandrel bending helps preserve the tubing’s shape through each bend, producing consistent geometry and smooth transitions throughout the pipe. The result is a carefully formed component built around the routing requirements of heavy-duty truck exhaust systems.

Our choice of 304 stainless steel delivers greater corrosion resistance than conventional 409 stainless construction—an advantage for trucks working through moisture, road spray, and changing seasons.

• Premium 304 stainless steel: Selected for corrosion resistance and lasting durability.

• One-piece pipe body: Continuous tubing through the bends, without welded section joints.

• Integrally formed 5-inch Marman flange: The flange is part of the tube itself, eliminating the flange-to-pipe weld.

• CNC mandrel-bent construction: Precision-controlled bends for consistent shape and repeatable geometry.

• Built for heavy-duty trucking: Designed with the demands of owner-operators, fleets, and commercial truck builders in mind.

From the material to the final formed flange, IDI Pro Series downpipes reflect our commitment to quality manufacturing and attention to detail.

Contact Induction Diesel Industries to select the right downpipe configuration for your truck.