DIESELR Cast Iron High Flow Exhaust Manifold (2003-2007 Cummins 5.9L)

Built to Perform:
Engineered to outperform the stock manifold, this heavy-duty upgrade boosts exhaust flow by up to 20% over factory. Matched ports and a merged runner design reduce backpressure for noticeable gains in performance and throttle response.

Durability You Can Count On:
Cast with 0.25" thick walls—a serious step up from the OEM’s 0.15"—to eliminate warping and cracking under extreme heat. The reinforced T3 flange adds strength where it matters most.

Bolt-On Power:
Designed as a direct replacement for a seamless install. Expect quicker turbo spool-up, lower EGTs, and improved overall drivability.

Fitment:
Fits 2003-2007 Dodge Ram with 5.9L Cummins Turbo Diesel engines.

What’s Included:

• (1) Heavy Duty Cast Iron High Flow Exhaust Manifold
  

Overview:

• Up to 20% More Exhaust Flow
  

• Thicker Wall Casting (0.25")

• Reduced Backpressure

• Faster Turbo Response

• Lower EGTs

• Reinforced T3 Flange