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Why 6.7L Cummins Owners Are Ditching Stock Exhaust Manifolds

If you own a 2007.5–2018 Ram with the 6.7L Cummins engine, chances are you’ve dealt with—or heard of—cracking, shrinking, or leaking stock exhaust manifolds. These common issues aren’t just annoying—they rob your truck of performance and can lead to costly repairs down the road.

So, what’s the fix?

Meet the T4i Exhaust Manifold by Diesel Power Source

Diesel Power Source has developed a solution that directly replaces your stock manifold with a purpose-built design: the T4i 2-Piece Exhaust Manifold. This bolt-on manifold fits the OEM HE300VG turbo and is engineered specifically for 6.7L Cummins trucks from 2007.5 to 2018 (excluding cab & chassis models).

Here’s what makes it different:

• Two-Piece Design with Expansion Joints
  Unlike single-piece manifolds that warp and crack under heat, the DPS T4i manifold expands and contracts naturally, preventing manifold shrinkage and increasing lifespan by over 3x.
• Dyno-Proven Gains
  With a 22% increase in exhaust flow and a 15 HP gain, you’ll notice quicker turbo spool, lower EGTs, and better performance overall—especially in towing applications or tuned builds.
• Direct Stock Replacement
  No need to hack or modify anything. It bolts right in place of your OEM manifold and is compatible with the factory turbo mounting pattern (T4 flange).
• Ready to Perform
  Every unit is fully assembled, pressure-tested, and finished with a high-temp black coating for durability and style.

Why This Matters

Poor manifold design isn’t just a nuisance—it leads to performance loss, gasket failure, and even cylinder damage due to uneven heat distribution. The DPS T4i addresses these issues with precision engineering and real-world testing.

If you’ve upgraded your turbo, tow heavy, or just want a better-than-stock solution, the T4i manifold is a game-changer.

Watch It in Action

Check out our YouTube video that breaks down the features and shows this manifold in action. See how it performs, how it’s built, and what sets it apart.

Conclusion

The DPS T4i Exhaust Manifold isn’t just a replacement—it’s a solution you can rely on. Built for performance, built to last, and built for the 6.7L Cummins.

Learn more and grab yours here:
Diesel Power Source T4i 6.7 Cummins Exhaust Manifold