1989–1993 Cummins 5.9L Turbochargers (Stock & Performance)

CPP Diesel offers a full lineup of turbo upgrades for 1989–1993 Dodge Cummins 5.9L (12-valve). From dependable OEM Holset H1C replacements to high-flow S300 ball-bearing turbos and complete compound turbo kits, we have the setup for towing, daily driving, sled-pulling, or drag racing.

Upgrade options include drop-in performance turbos that deliver lower EGTs and improved spool, as well as compound systems for maximum power output and throttle response. We also carry essential accessories like turbo drain kits and plumbing components to complete your installation.

Frequently Asked Questions

What turbo did 1989–1993 Cummins trucks come with?

These trucks originally came with the Holset H1C turbocharger, featuring an 18 cm housing on early trucks and a 21 cm housing on later models, designed for reliable everyday performance.

Can I upgrade to an S300 turbo?

Absolutely. S300 ball-bearing turbos offer quicker spool times, more durable bearings, and increased airflow—perfect for performance builds without losing drivability.

Do you sell compound turbo kits for this generation?

Yes. We offer complete compound or twin-turbo kits designed for 1989–1993 Cummins, including high-quality coolant and intercooler plumbing like Crazy Carl’s and Stainless Diesel components.

Will turbo upgrades lower my EGTs?

Yes. Performance drop-in turbos like the S300 and other upgrades significantly improve flow, often resulting in noticeable drops in EGT during heavy load or sustained high-speed driving.

Do you stock installation parts?

Absolutely. We carry turbo mount and drain kits, gaskets, clamps, and other accessories to ensure you have everything needed for a clean installation.

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