S400 Cummins ISX Turbo Conversion Kit | Piping, Oil Lines, and Hardware for 2008–2024 ISX / ISX15 / X15
The Diesel Power Source® S400 Turbo Conversion Kit provides all of the piping, oil lines, adapters, and hardware needed to install a BorgWarner S400-series turbo on a 2008–2024 Cummins ISX, ISX15, or X15 engine. This kit is designed for owners and shops who already have their own S400, S410, S475, S478, S480, or other T6-flange turbo and need the supporting components to complete the conversion.
Important: This kit does NOT include a turbocharger or exhaust manifold. If you need everything in one box (turbo, manifold, and all hardware), see the S400 Cummins ISX Complete Turbo Conversion Kit.
Who Is This Kit For?
This piping and hardware kit is the right choice if you fall into one of these situations:
- You already own an S400/S410 or compatible T6 turbo and need the ISX-specific plumbing, oil lines, exhaust adapter, and hardware to install it.
- You already have a T6 exhaust manifold (from a previous build, a separate purchase, or from the DPS T6 manifold product line) and just need the conversion hardware.
- You're a shop or fleet that stocks turbos and manifolds separately but needs the ISX-specific piping kit to complete S400 conversions efficiently.
If you don't already have a turbo and manifold, the S400 Complete Turbo Conversion Kit includes everything: turbo, T6 manifold, and all hardware in one package at a better value than buying components separately.
What's Included
- Rubber intake elbow
- Cast turbo compressor elbow (90° or 45°, selected at checkout)
- Turbo oil supply line with fittings
- Turbo oil drain tube with gasket
- Exhaust stainless steel V-band adapter or cast exhaust adapter (determined by ESN and engine manufacture year)
- Couples directly to factory exhaust
- 5.5" V-band clamp
- Hose clamps
- Turbo studs and nuts
- Oil supply fittings
- T6 turbo flange gasket
- Oil drain gasket
- Coolant block-off fittings
- Air compressor filter kit (filters approximately 15–20 microns)
Air compressor filter note: If operating in dusty or off-road conditions, use a lower micron filter or route the air compressor back through the intake filter for additional protection.
What's NOT Included
- Turbocharger — Use your own S400, S410, S475, S478, S480, or any T6-flange turbo. Need a turbo? See: Turbonator® VGT S475 / S478 / S480 Turbo
- Exhaust manifold — A T6 manifold is required for S400 turbo fitment. See: DPS T6 Exhaust Manifold for Cummins ISX
- Manifold studs, nuts, and head gaskets — If you're also replacing the manifold, we recommend ordering the hardware kit separately. See: Cummins ISX15 / X15 Exhaust Manifold Stud & Nut Hardware Kit
Compatible Turbochargers
This kit is designed to work with any turbocharger that uses a T6 exhaust flange. Common compatible turbos include:
| Turbo | Compressor Size | Notes |
|---|---|---|
| BorgWarner S475 | 75mm | Cross-ref 171702. Fastest spool. Best for towing and daily driving. |
| BorgWarner S478 | 78mm | Balanced spool and top-end airflow. |
| BorgWarner S480 | 80mm | Maximum airflow. Best for higher HP builds. |
| BorgWarner S400 / S410 | Various | Any S400-series with T6 flange and 96mm turbine wheel. |
| Other T6-flange turbos | Various | Any turbocharger with a T6 exhaust inlet flange. |
For enhanced spool-up and exhaust braking capability on any of these turbos, add the Turbonator® VGT exhaust housing. The Turbonator® fits S475, S478, S480, S483, S488, and any S400 turbo with a 96mm turbine wheel.
Fitment
This conversion kit fits Cummins ISX and ISX15 engines with CM871, CM2250, CM2350, and X15 ECM platforms (2008–2024). Compatible with Freightliner, Peterbilt, Kenworth, Volvo, International, and Western Star trucks.
This kit is for use on previously deleted, non-emissions trucks only. Diesel Power Source® does not sell or support emissions delete components.
Please provide your Cummins Engine Serial Number (ESN) and select your engine manufacture year range when ordering. The exhaust outlet adapter included in the kit varies by ESN and year, so accurate information is required for correct fitment.
How to Find Your Exhaust Outlet Connection Part Number
When ordering, you'll select your exhaust outlet connection part number. This number is cast or stamped on the exhaust outlet pipe. The available options are:
- 3686707, 3686708, 3688976
- 3684411 (direct exhaust connection)
- 3688976, 3689539, 3689540
If you're unsure where to find this number, refer to the image below or contact our team with your ESN.
Recommended Add-Ons
Building a complete S400 conversion from individual components? Here's what you'll need alongside this piping kit:
- DPS T6 Exhaust Manifold for Cummins ISX — Required. S400 turbos need a T6 manifold.
- Turbonator® VGT S475 / S478 / S480 Turbo — DPS turbo with optional Turbonator® VGT for exhaust braking
- ISX15 / X15 Exhaust Manifold Stud & Nut Hardware Kit — Studs, nuts, and hardware for manifold installation
- Turbonator® VGT Exhaust Housing (Housing Only) — Adds VGT braking and spool-up to your existing S400 turbo
Or skip the individual component approach and get everything in one box: S400 Complete Turbo Conversion Kit (Includes Turbo, T6 Manifold, and All Hardware)
Why Choose Diesel Power Source?
- CFD-Tested Components — All air and exhaust components are tested using Computational Fluid Dynamics for optimized flow
- ESN-Verified Fitment — We confirm the correct exhaust adapter for your specific truck before shipment
- Broad Turbo Compatibility — Works with S400, S410, S475, S478, S480, and any T6-flange turbo
- Fleet and Shop Friendly — Standardized piping kit for efficient repeat conversions
- Made in the USA
Warranty
This Diesel Power Source® S400 Turbo Conversion Kit includes a 1-year limited warranty and is backed by our technical support team for fitment and installation guidance.
Related ISX15 / X15 Products
- S400 Complete Turbo Conversion Kit (Includes Turbo, T6 Manifold, and All Hardware)
- ISX15 / X15 Compound Turbo Kit | S472/S488 and S475/S488 | 550–700 HP
- DPS T6 Exhaust Manifold for Cummins ISX (S400 Fitment)
- ISX15 / X15 Exhaust Manifold Stud & Nut Hardware Kit
- HE400VG Turbo Replacement for Cummins ISX15 / X15 (Factory VGT Option)
- ISX15 / X15 Non-EGR Exhaust Manifold (Stock Turbo Fitment)
Frequently Asked Questions
No. This kit includes all of the piping, oil lines, exhaust adapter, and hardware needed to install a T6-flange turbo on your ISX engine, but the turbo and manifold are sold separately. If you need everything in one box, see the S400 Complete Turbo Conversion Kit, which includes the turbo, T6 manifold, and all hardware.
This kit works with any turbocharger that uses a T6 exhaust inlet flange. Compatible turbos include the BorgWarner S400, S410, S475, S478, S480, S483, S488, and any other T6-flange turbo. DPS also offers the Turbonator® VGT exhaust housing, which can be added to any compatible S400 turbo for variable geometry braking and faster spool-up.
This kit fits 2008–2024 Cummins ISX and ISX15 engines with CM871, CM2250, CM2350, and X15 ECM platforms. It is designed for previously deleted, non-emissions trucks only. Please provide your Engine Serial Number (ESN) and engine manufacture year when ordering so we can include the correct exhaust outlet adapter for your truck.
Yes. BorgWarner S400-series turbochargers use a T6 exhaust inlet flange, which is different from the factory Holset turbo mounting. Your stock manifold will not bolt directly to an S400 turbo. DPS offers the T6 Exhaust Manifold for Cummins ISX designed specifically for this conversion.
This kit ($1,899) includes only the piping, oil lines, exhaust adapter, and hardware needed for an S400 conversion. The S400 Complete Conversion Kit ($4,799) includes everything: an S400 turbo (S475, S478, or S480), the DPS T6 exhaust manifold, and all of the same piping and hardware. Choose this kit if you already own a compatible turbo and/or manifold. Choose the complete kit if you need everything.
5 Reviews
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Happy with it
Been running it a few months now. No problems.
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S478 kit on my ISX
Upgrade from the stock turbo setup. Paid 2 day shipping but took 4 days for weather truck off road extra time
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Good kit
Everything showed up and fit like it should.
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Works good
Installed this with an S475 and the truck runs strong.
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Straightforward install
Put this kit on with a Borg S475. Everything bolted up pretty clean. Had to tweak one clamp but nothing major. Truck definitely breathes better now.
