R.A.D. Ram RHO and HO Downpipe

Relentless Automotive Development Downpipe with GESI High Flow Catalytic Converter

For Ram RHO and HO Engines

The Relentless Automotive Development high flow downpipe is engineered specifically for the Ram RHO and HO platform to improve exhaust flow and reduce restriction while maintaining precise fitment and long term durability. It replaces the restrictive factory downpipe with a precision built 304 stainless steel assembly featuring a GESI 85200 high flow catalytic converter designed to support higher horsepower applications.

Each downpipe is TIG welded and fully back purged for consistent weld quality. OEM mounting locations are retained to ensure proper alignment and a true bolt on installation.

Optimized Flow and Thermal Management

This downpipe utilizes an optimized diameter configuration to maximize exhaust flow while maintaining proper gas velocity. It features 4 inch tubing with a gradual taper to 3.25 inch prior to the mid pipe connection, allowing efficient exhaust expansion while maintaining consistent flow characteristics. A 4.5 inch catalytic converter is used to minimize restriction through the catalyst before transitioning to the factory mid pipe.

Compared to the factory 3 inch downpipe, internal cross sectional area is increased by approximately 78 percent. This allows exhaust gases to exit the turbine more efficiently and reduces backpressure on the turbine side.

Thermal management is handled through a ceramic coating applied as standard to every downpipe, helping reduce radiant heat and manage under hood temperatures.

Dyno Tested Performance Results

Dyno testing shows consistent gains across the powerband compared to factory downpipes. Results below reflect rear wheel horsepower and rear wheel torque measured under the same conditions.

• Stock downpipes with factory calibration
465 rwhp and 520 rwtq

• R.A.D. downpipes with factory calibration
506 rwhp and 534 rwtq

• CAT6 Map1 with R.A.D. downpipes
551 rwhp and 577 rwtq

• CAT6 Map2 with R.A.D. downpipes
578 rwhp and 595 rwtq

• CAT6 Map3 with R.A.D. downpipes
575 rwhp and 608 rwtq

Actual results may vary based on vehicle condition, fuel quality, environmental conditions, and calibration.

Key Features and Specifications

Fitment

Fits Ram trucks equipped with the HO engine platform, including RHO and applicable HO trims. All HO equipped trucks utilize the same factory downpipe configuration.

Emissions and Compliance

Intended for 49 state use where permitted by local regulations. Not legal for sale or use on emissions controlled vehicles in the state of California. Buyer is responsible for compliance with all applicable federal, state, and local emissions laws.

Build Time and Shipping

This product is built to order. Current build time is up to 6 weeks prior to shipment. Tracking information will be emailed once the order ships.

Warranty

Lifetime warranty against defects in workmanship on the downpipe assembly. The catalytic converter carries a one year manufacturer warranty. Warranty does not cover normal wear, abuse, improper installation, or emissions related enforcement issues.

FAQ

Does this downpipe fit all Ram HO engines
Yes. All Ram trucks equipped with the HO engine platform use the same factory downpipe configuration.

Is tuning required
No tuning is required for installation. Additional tuning may further increase performance depending on vehicle setup.

Is this downpipe emissions compliant
This downpipe is intended for 49 state use where permitted and is not legal for use on emissions controlled vehicles in California.