MBRP S6150409 Turbo Back Exhaust System Stainless Steel - 4 Inch T409 Dodge Ram Cummins

The MBRP S6150409 is a complete 4-inch turbo-back exhaust system engineered specifically for 1988-1993 Dodge Ram D250/D350 trucks equipped with the 5.9L Cummins diesel engine and 4WD drivetrain. This Armor Plus Series system delivers significant performance gains through improved exhaust flow while providing excellent value and durability.

Construction and Materials:

Crafted from T409 stainless steel, this exhaust system offers superior corrosion resistance compared to aluminized steel while maintaining an affordable price point. The T409 material resists penetrating rust and stands up to harsh conditions, making it an ideal choice for daily drivers in moderate climates. All tubing features mandrel-bent construction that eliminates rippling in the bends, ensuring smooth, unrestricted exhaust flow from the turbo outlet to the exit point.

Key Features:

• 4-inch mandrel-bent stainless steel tubing for maximum flow
• 3.5-inch turbo downpipe optimized for Cummins turbo outlet
• Single side exit configuration with mirror-polished 5-inch tip
• Bolt-on installation design for straightforward fitment
• Lifetime warranty coverage against manufacturing defects
• Easy to clean and maintain stainless steel finish

Performance Benefits:

By replacing the restrictive factory exhaust system with 4-inch mandrel-bent tubing, this MBRP system significantly reduces backpressure and improves exhaust gas evacuation. The result is enhanced engine breathing that allows more fresh air into the cylinders, producing measurable gains in horsepower, torque, and throttle response. The improved flow also helps reduce exhaust gas temperatures (EGTs), which contributes to improved engine longevity and performance consistency under heavy loads.

Installation Notes:

This system is designed as a bolt-on replacement for the factory exhaust, though some cutting may be required during installation to ensure proper fitment. The single side exit configuration routes exhaust gases out to the side of the vehicle, providing a clean appearance and aggressive exhaust note. Professional installation is recommended for best results.

Important Considerations:

While T409 stainless steel provides excellent rust resistance, exposure to heavy winter salt, coastal salt air, and aggressive road treatments may accelerate surface corrosion over time. This cosmetic corrosion is not covered under MBRP's warranty unless the part fails completely. Regular cleaning is recommended in harsh environments to maintain appearance and maximize longevity.

This exhaust system is exclusively compatible with 4WD models and will not fit 2WD configurations due to differences in chassis layout and clearance requirements.