Diamond Eye Manufacturing K4234A-2 4-Inch Aluminized Cat-Back Exhaust Kit Single Exit

The Diamond Eye Manufacturing K4234A-2 is a 4-inch aluminized cat-back exhaust kit engineered for the Dodge RAM 2500/3500 equipped with the 5.9L Cummins diesel engine. Designed for diesel truck owners who demand improved exhaust flow, deeper sound, and real-world performance gains, this kit replaces the restrictive factory exhaust from the catalytic converter back.

Diamond Eye builds each system using CNC mandrel-bent tubing that maintains full pipe diameter through every bend, eliminating the flow restrictions common in crush-bent OEM exhaust. The result is a freer-flowing exhaust path that helps lower exhaust gas temperatures (EGTs) and unlock additional horsepower and torque.

Key Features:

• 4-inch aluminized steel construction — 16-gauge material for durable, corrosion-resistant performance
• CNC mandrel-bent tubing — maximizes exhaust flow and reduces back pressure
• Fasttrak performance muffler — straight-through perforated core delivers a deep, aggressive diesel tone
• Single side-exit configuration — clean, purposeful routing for a factory-correct appearance
• Lowers EGTs — improved exhaust scavenging benefits towing and high-load performance
• Bolt-on installation — utilizes OEM hangers and mounting points; hardware, clamps, and step-by-step instructions included
• Compatible with all cab and bed length configurations

The K4234A-2 pairs well with aftermarket intake and tuning upgrades to maximize the performance potential of your Cummins diesel. Diamond Eye Manufacturing, based in eastern Oregon, is recognized as one of the most modern diesel exhaust fabricators in the industry, with a dedicated manufacturing complex producing exhaust components from 3/8-inch up to 5-inch OD tubing in both aluminized and stainless steel.