Smeding Diesel S400 Second-Gen Turbo Kit with Manifold (2007.5–2012 6.7L Cummins)

Built for Towing, Racing, and Everyday Driving

The Smeding Diesel S400 Kit transforms your 6.7L Cummins into a truck that’s not only more powerful, but more enjoyable to drive every day. Whether you’re towing heavy, racing at the track, or just running errands, this kit delivers performance, reliability, and the iconic second-gen Cummins sound that enthusiasts crave.

Why It’s Great for Every Driver

Towing Made Easier

• The second-gen turbo location and S400 airflow design help keep EGTs lower while hauling.

• More airflow under load means stronger pulls on grades and reduced turbo stress.

• Select the right housing/turbo combo to maximize torque and drivability on long trips.

Race-Ready Performance

• Larger billet and cast wheel options (S467, S472/87, SXE-R) deliver serious horsepower potential.

• Quick-spool turbine housings give you instant throttle response with top-end airflow to back it up.

• Perfect for drivers looking to push their Cummins beyond stock limits.

Daily Driving Enjoyment

• Smooth, responsive power delivery makes your truck fun to drive in any setting.

• The 5″ intake and intercooler piping sharpen throttle feel for a clean, crisp driving experience.

• Reliability is baked in — this kit is built for everyday use, not just weekend fun.

That True Second-Gen Sound

• Relocating the turbo into the second-gen position unleashes the legendary turbo whistle and exhaust tone.

• Adds personality and excitement every time you get on the throttle — your truck won’t just perform better, it’ll sound better too.

Complete Kit – Everything You Need

This is a true bolt-on solution, with no missing pieces:

• S400 Turbocharger (S464–S472, billet or cast options)

• T4 3-Piece Exhaust Manifold

• 4″ Downpipe

• 5″ Intake Kit with S&B Filter

• Oil Feed & Drain Lines

• Intercooler Piping & Full Hardware

Why Choose Smeding Diesel?

• Performance Your Way – Tow, daily drive, or race — this kit adapts to your goals.

• True Second-Gen Sound – That signature turbo whistle and Cummins growl enthusiasts want.

• Assembled & QC-Tested in the USA – Built by diesel enthusiasts for diesel enthusiasts.

• Fast Shipping – Most kits leave our shop in 24–48 hours.

• Real Support – Phone, email, or chat with people who run these turbos themselves.

T4 .90 exhaust housings are not recommended for the 6.7L Cummins

The 1.0 T4 housing is the best option for the 6.7 Cummins 

If you have any questions, call us at 210-446-0888