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4th Gen 6.7 Cummins | 2007.5 – 2012

Early 4th Gen 6.7 Cummins Parts (2007.5–2012)

Engineered for clean fitment and strong towing performance on the 2007.5–2012 Ram 2500/3500 6.7L Cummins. Diesel Power Source upgrades improve airflow, turbo efficiency, and temperature control for daily drivers, tow rigs, and balanced street builds.

Use this page as your Early 4th Gen 6.7L hub. Detailed specs, BOMs, and year-specific notes live on the individual product pages. Select the path below that matches your goals; then review the product listing for exact contents and fitment details.

Shop popular upgrade paths

Why upgrade your 2007.5–2012 6.7 Cummins

  • Lower EGT on grades: Smoother runners and optimized turbine geometry reduce drive pressure when towing.
  • Faster spool and midrange torque: Better collector design helps the turbo light earlier for steadier speed.
  • Durability: Thick-wall castings and precision-machined flanges resist warping and leaks across heat cycles.
  • Clean fitment: Components modeled around 4th-gen bay clearances for service access and repeatable installs.

Choose the right path

  • Towing & daily: Stock-replacement manifold with a quick-spooling S300-class turbo; monitor EGT on first towing runs.
  • Street performance: Mid-size S300 or compact S400 with the correct turbine A/R to hold speed without excessive lag.
  • High-fuel builds: Larger S400 or compound-over-stock for airflow headroom; plan converter, gearing, cooling, and brakes.

Fitment checklist (2007.5–2012)

  • Confirm turbo flange (T3/T4/T4i) and actuator/sensor provisions for your setup.
  • Verify downpipe route, intercooler path, and clearance at steering shaft, heater box, and A/C lines.
  • Plan fresh gaskets, quality hardware, heat shielding, and ports if logging EGT or drive pressure.

Install & first-drive notes

  • Use new gaskets; torque in sequence on a cold engine.
  • Pressure-test the charge-air system before first start; eliminate any pre-turbine leaks.
  • On shakedown, monitor boost/EGT and re-check fasteners after heat cycles if specified.

Comparing other generations? See 3rd Gen 5.9 (2003–2007) or Late 4th Gen 6.7 (2013–2018).

Frequently asked questions

Do I need tuning for a manifold swap on a 6.7 (2007.5–2012)

Not typically. If you change turbo size or fueling, a calibration update can optimize response, shift strategy, and regen behavior.

T3 vs T4/T4i on Early 4th Gen

T3 supports quick-spool tow goals. T4/T4i adds airflow headroom for larger singles or compounds; expect later spool without other supporting mods.

Is compound required for towing

No, but compound-over-stock widens the efficiency window for heavy GCW, heat, or elevation, keeping response strong while controlling EGT.

Will upgrades work with emissions equipment installed

Many components are designed to operate with factory systems when installed as directed. Always follow local regulations and product guidance.

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