Aluminized HX40 Down Pipe – Diamond Eye 221040

Upgrade your turbocharged 5.9L Cummins with the Diamond Eye 221040 Aluminized HX40 Down Pipe. This 4-inch direct-fit turbo downpipe is engineered specifically for Dodge Ram 2500/3500 trucks (1994–2002) running an HX40-style turbocharger with a 4" outlet.

Constructed from high-quality aluminized steel and mandrel-bent for consistent diameter and maximum flow, the 221040 reduces exhaust restriction and backpressure. The result is quicker turbo response, lower EGTs, improved horsepower and torque, and better fuel efficiency.

Key Features & Benefits

• 4" diameter aluminized steel construction for durability and corrosion resistance
• Direct HX40 turbo flange connection (bolt-on design)
• Mandrel-bent tubing for unrestricted exhaust flow
• Reduces EGTs and exhaust backpressure
• Improves horsepower, torque, and throttle response
• Helps increase fuel economy
• Designed for easy installation on modified 5.9 Cummins applications

Fitment: 1994–2002 Dodge Ram 2500/3500 5.9L Cummins with aftermarket HX40 (or compatible HTT/HTB-style) turbocharger featuring a 4" outlet. Fits all cab and bed configurations.

Note: A 4" V-band clamp is typically required for installation and is sold separately (or available in complete kits such as the 221043).

Perfect for trucks that have been upgraded with a larger HX40-style turbo and need a properly sized, free-flowing downpipe to match.