4 inch Turbo Back Single Side Exit Exhaust

Features:

• Fits 1989–1993 RAM D250/D350 5.9L Cummins 2WD
• Full turbo-back system maximizes exhaust flow
• 4" mandrel-bent tubing for smoother airflow
• Reduces backpressure and exhaust gas temperatures
• Boosts torque and overall throttle response
• Aluminized steel construction for affordable durability
• Aggressive diesel tone under acceleration
• Single side exit for a clean stock-style finish
• Ideal for towing and work use
• Improves fuel efficiency under load
• Includes clamps and all installation hardware
• Easy bolt-on installation using factory-style hangers

Bring New Life To Your First Gen Cummins

If you’re driving a 1989–1993 Dodge RAM D250 or D350 with a 5.9L Cummins and you want to open it up with real sound and performance, the MBRP S6148AL 4 Inch Turbo Back Exhaust is the upgrade you’ve been waiting for. This system brings your truck’s deep diesel tone to the surface, letting your Cummins breathe freely and pull harder. Whether you’re towing a trailer, working the back roads, or just rolling coal for fun, you’ll feel and hear the difference right away. The aggressive sound pairs with real performance gains, thanks to unrestricted flow from the turbo all the way out. It’s built from aluminized steel to keep the cost low without sacrificing everyday strength. You get a single side exit for a clean, stock-style appearance, but everything else about this exhaust screams power. With all necessary hardware included and a simple bolt-on design, this system lets you enjoy a better drive without the hassle. For owners who want their first gen to sound mean and run stronger, this one checks every box.

Built For Flow Performance And Cooling Efficiency

The MBRP S6148AL Turbo Back Exhaust System is engineered specifically for 2WD Dodge RAM D250 and D350 trucks with the 5.9L Cummins from 1989 to 1993. As a full turbo-back system, it replaces everything from the turbocharger outlet to the tailpipe, eliminating factory restrictions and optimizing exhaust flow. The 4-inch mandrel-bent tubing ensures smooth transitions throughout the system, which significantly reduces backpressure and helps lower exhaust gas temperatures under load. These improvements support better turbo spool and throttle response, making it ideal for heavy towing, hill climbs, or extended work cycles. The aluminized steel construction offers a budget-conscious option that still provides strong protection against heat and corrosion in dry or moderate climates. It’s a practical performance solution for those looking to boost efficiency and airflow without overspending. The included clamps and hangers make installation straightforward, especially with its factory-style fitment. This system is purpose-built to deliver reliable gains and an unmistakable diesel tone that complements the power of your first-gen Cummins.

Fits: 1989, 1990, 1991, 1992, 1993 Dodge RAM D250/D350 Cummins 2WD

Notes:

• Designed to fit 1989–1993 Dodge RAM D250 and D350 2WD with 5.9L Cummins engine
• Turbo-back system replaces the entire factory exhaust from turbo outlet to tailpipe
• Not emissions compliant in all regions due to full turbo-back design
• Ideal for off-road use or trucks operating in non-restricted areas
• Constructed from aluminized steel for cost-effective durability
• Mandrel-bent 4-inch tubing improves flow and reduces backpressure
• Helps lower exhaust gas temperatures under heavy load or towing
• Delivers a deeper and more aggressive exhaust tone
• Single side exit provides a clean OEM-style appearance
• Includes clamps and hangers for straightforward bolt-on installation
• Best suited for dry to moderate climates to minimize corrosion risk
• Recommended for users seeking performance and sound on a budget