DPS 24V Cummins Compound Turbo Kit 1998.5–2002 Dodge Ram | 2nd Gen Twin Turbo System

24V Cummins Compound Turbo Kit | 2nd Gen Twin Turbo System | 1998.5–2002 Dodge Ram

The Diesel Power Source® compound turbo kit is a complete twin turbo system for 1998.5–2002 Dodge Ram 2500 and 3500 trucks with the 24-valve 5.9L Cummins engine. This turn-key kit includes both turbos (S300 high-pressure and S400 atmospheric), a 3-piece high-flow exhaust manifold, all charge piping, oil lines, air intake, a 4" exhaust downpipe, and all hardware needed for installation. From stock power up to 1,100 HP, these sequential turbo kits bolt on with no cutting or fabrication required.

Available in thirteen turbo size configurations ranging from 625 HP to 1,100 HP, with optional Turbonator® VGT upgrade for exhaust braking and faster spool, and optional ball bearing upgrade for 150–200 RPM quicker spool-up. Whether you are building a 1999 Cummins turbo upgrade for towing, a 2001 Dodge Ram 2500 turbo setup for daily driving and performance, or a 2002 Cummins turbo platform for competition, DPS has a compound kit sized for your 24-valve build.

Compounds and the VP44: What 24V Owners Need to Know

The 1998.5–2002 24-valve Cummins uses the Bosch VP44 rotary injection pump, which introduced electronic fuel control to the Cummins platform. Unlike the fully mechanical P7100 pump on the 12V trucks, the VP44 allows the ECM to adjust injection timing and fuel volume electronically, giving the engine smoother power delivery and better fuel economy at stock power levels.

When you add a compound turbo system to a 24V Cummins, the VP44 benefits from the increased airflow by burning fuel more completely at lower exhaust temperatures. However, the VP44 does have a maximum flow ceiling that becomes a factor at higher horsepower levels. Most 24V compound builds in the 500–700 HP range run the stock VP44 or a modified pump without issue. Builds pushing beyond 700 HP typically require a higher-volume VP44 or a dual-feed fuel system to keep up with the air the compounds can deliver.

The compound system itself is not limited by the VP44. The turbo kit supports up to 1,100 HP with the appropriate fueling and supporting modifications. DPS can help you match the right stage to your fuel system capabilities.

How Compound Turbos Work on a 24V Cummins

A compound (twin turbo) system uses two turbochargers working in series. The smaller S300 high-pressure turbo spools first at low RPM, delivering the instant throttle response that makes the truck feel responsive from idle. As RPM and load increase, the larger S400 atmospheric turbo takes over the majority of the compression work, providing sustained airflow for high-HP applications without the lag that large single turbos create.

The two turbos share the compression work, which means each operates in its most efficient range. The result is boost air that is over 100°F cooler than a single turbo at the same pressure, boost-to-drive pressure ratios approaching 1:1, and 250–450°F lower EGTs under load. For 2nd gen owners who tow with a 1999 Dodge Ram turbo, 2000 Cummins turbo, or 2001 24 valve Cummins, this EGT reduction is the single biggest benefit of going to compounds.

For a detailed explanation, see: How Do Compound Turbos Work? | Compound Turbochargers Explained

Stage Selection Guide

How to choose: Estimate your target rear-wheel HP, then multiply by 1.25. For a 1998.5 Cummins turbo or 2001 Cummins turbo build focused on towing and daily use, Stage 2.5 through 5 covers most builds (625–700 HP). Keep in mind that the VP44 injection pump supports most builds in this range without modification. Builds beyond 700 HP will benefit from a higher-volume VP44 or dual-feed fuel system. Competition and sled pulling trucks typically run Stage 8 or 8.5.

Turbonator® VGT Upgrade Options

Each compound kit can optionally include the Diesel Power Source® Turbonator® VGT exhaust housing on the S300 high-pressure turbo. This adds variable geometry capability for faster spool-up and exhaust braking, which the base fixed-geometry S300 does not provide.

• Base Option (Non-VGT) — Standard fixed-geometry S300 with wastegate. No exhaust brake through the turbo.
• VGT Without Exhaust Brake (+$950) — Adds Turbonator® VGT for approximately 200 RPM faster spool
• VGT With Exhaust Brake (+$1,850) — Adds Turbonator® VGT with full exhaust brake capability

The Turbonator® VGT works on all 24V Cummins truck years and is self-contained. It is recommended for trucks that tow regularly and can be combined with the ball bearing upgrade for maximum low-RPM response.

What's Included

• S300 High-Pressure Turbo (S362, S363, or S366 based on stage) with wastegate for adjustable boost
• S400 Atmospheric Turbo (S475 or S480 based on stage)
• 3-Piece High-Flow Exhaust Manifold with pre-tapped pyrometer ports
• Complete air intake with high-flow air filter
• Kevlar/Nomex lined silicone low-pressure charge pipe
• High-pressure metal charge pipe
• Cast hot pipe with external wastegate port (not welded thin steel)
• Support bracket for atmospheric (large) turbo
• Steel braided oil supply lines for both turbos
• Stainless steel oil drain lines (two separate drains)
• 4" exhaust downpipe (included with 24V kits)
• V-band clamps, T-bolt clamps, and all hose clamps
• Turbo and manifold gaskets
• All mounting bolts, oil line adapters, and installation hardware

Key Features

• Complete Kit — Both turbos, 3-piece manifold, all piping, oil lines, downpipe, and hardware included
• Direct Bolt-On for 2nd Gen 24V — No cutting or fabrication required
• 250–450°F Lower EGTs — Two-stage compression runs dramatically cooler than any single turbo
• 22–30% HP Increase — Depending on stage and supporting modifications
• Near-Stock Spool-Up — S300 lights up at low RPM, S400 carries top-end airflow
• Boost Exceeds Drive Pressure — Compound efficiency approaches 1:1 ratio
• Wastegated — Adjustable boost control on the high-pressure turbo
• Cast Hot Pipe — Not welded thin steel. Won't crack under thermal cycling.
• CAD/CAM and CFD Designed — Engineered for factory-like fit with optimized airflow
• Optional Turbonator® VGT — Add exhaust braking and 200 RPM faster spool
• Optional Ball Bearing — 150–200 RPM faster spool on the S300
• Optional Large Turbo Upgrades — S475 Billet with Race Housing (+$200) or S480 Billet with Race Housing (+$400)

Fitment

This compound kit fits 1998.5, 1999, 2000, 2001, and 2002 Dodge Ram 2500 and 3500 trucks with the 24-valve 5.9L Cummins engine (2nd generation).

Automatic transmission note: 2nd gen trucks with automatic transmissions (47RE) require the transmission oil cooler on the side of the engine block to be removed, bypassed, or relocated to the frame for compound turbo clearance. A relocation kit is available for $149.

These kits do not have a CARB exemption (exhaust manifolds do).

Have a different gen truck?

• 1st Gen Compound Kit (1989–1993 12V Cummins)
• 12V Compound Kit (1989–1998 Cummins)
• 5.9 Common Rail Compound Kit (2003–2007 3rd Gen)
• 6.7 Cummins Compound Kit (2007.5–2018 4th Gen)

Need a Fummins or Chummins conversion with compound turbos? DPS builds those too.

Head Stud and Fire Ring Recommendations

• Head studs recommended at 55+ PSI sustained boost
• Fire rings recommended at 65+ PSI sustained boost

The compound system is capable of well over 55 PSI but is fully adjustable. Follow proper torque specifications and break-in procedures when installing studs.

Why Diesel Power Source for 24V Compound Turbos?

Diesel Power Source® has been building compound turbo kits for 2nd gen 24V Cummins trucks since the beginning. These kits are designed using CAD/CAM software and CFD (Computational Fluid Dynamics) testing for factory-like fit with proven diesel performance results. Thousands of 24V trucks are running DPS compound systems for towing, daily driving, and competition.

• Complete Kit — Everything in one box including 4" downpipe for 24V trucks
• 13 Stage Options — From 625 HP towing builds to 1,100 HP competition setups
• CFD-Tested Airflow — Optimized piping and manifold geometry
• Bolt-On Fit — No cutting, welding, or fabrication
• Proven Platform — Thousands of kits sold for 2nd gen Cummins
• Designed and Built in the USA

Related 24V Cummins Products

• Add-a-Turbo Kit for 24V Cummins (Uses Stock HX35 Turbo)
• DPS S300 Single Turbos for 24V Cummins (1998.5–2002)
• 5.9 Common Rail Compound Kit (2003–2007)
• 12V Cummins Compound Kit (1989–1998)
• 6.7 Cummins Compound Kit (2007.5–2018)
• Fummins Compound Kit
• Chummins Compound Kit
• Blog: How Do Compound Turbos Work?

• S362/68 over S475 - Max 625hp- Stg 2.5
• S362/68 over S480 - Max 650hp- Stg 3
• S362/68 Ball Bearing over S475- Max 625hp - Stg 3.5
• S363/68 over S475 - Max 650hp- Stg 4
• S363/68 over S480 - Max 675hp- Stg 4B
• S363/68 Ball Bearing over S475 - Max 650hp - Stg 4.5
• S363/68 Ball Bearing over S480 - Max 675hp - Stg 4.5B
• S363/73 over S475 - Max 700hp - Stg 5
• S363/73 Ball Bearing over S475 - Max 700hp - Stg 5.5
• S363/73 over S480 - Max 750hp - Stg 6
• S363/73 Ball Bearing over S480- Max 750hp- Stg 6.5
• S366/73 over S480 - Max 1100hp - Stg 8
• S366/73 Ball Bearing over S480- Max 1100hp - Stg 8.5

3 Reviews

• 5

  2nd Gen compound turbos.

  Posted by Nathanial Mogensen on Apr 9, 2025

  Running these turbos has made my truck a whole new rig! I maintain boost while shifting gears and am running 300° cooler egt's. This kit make driving and towing with an nv4500 transmission a pleasure again. Thank you fellas!

• 5

  Hello, I

  Posted by Greg P on Mar 31, 2023

  Hello,I do not normally comment on my truck part purchases, but I felt the quality of your kit was worth taking the time for. I recently purchased one of your stocker / S475 kits for my 06 ram. I have to say I am very impressed with the quality and packaging you guys do. This is my first compound turbo set up. I looked at many kits before purchasing yours. I looked at cheaper and more expensive. I had nearly talked myself into buying a cheaper kit. After receiving your kit I was immediately satisfied with spending the extra money on it. I opened the kit and was very impressed with the packaging alone. I thought to myself, if it performs half as well as it is packaged, I was going to be very happy. I had one issue after installation, but it turned out to be my fault for assuming. I assumed the tube from the output of the S475 to the input of my stock turbo was molded to the connector that uses V band clamp onto the S475. I had one extra clamp once installed and I thought it was odd, however I took the truck for a test ride and was very impressed with the faster spool up but the system got very loud and not as much boost as I had anticipated. I found out very quickly where the extra clamp went. After that mistake was remedied, the system is performing flawlessly. I am very satisfied with this kit. I look forward to putting it to the test towing in the Colorado mountains. I will be purchasing your intake for this same truck as well as probably upgrading my stock turbo to one of your new ball bearing turbos in the near future. I will not hesitate to recommend you guys to anyone who asks.

• 5

  Towing

  Posted by Michael Venter on Nov 26, 2022

  Best thing I could have done sooner was do compounds for my 6.7Cummins! Stock fuel with some items not on the truck and it tows awesome. Steep grades and EGTs issues are a thing of the past! Great kit