Holset Turbochargers

Updated May 12, 2026

For the diesel-application context that anchors Holset\'s OEM dominance, see the Read the diesel turbocharger buyer guide — covers Cummins 6.7L, Ford 6.7L Power Stroke, and GM Duramax install bases with tier-by-chassis cross-shop.

Holset Brand Lineage

Holset Engineering Co. was founded in Huddersfield, England in 1952 and acquired by Cummins Inc. in 1973. Rebranded internally to Cummins Turbo Technologies (CTT) in 2006, the Holset name continues across product labeling, OE part numbers, and aftermarket distribution channels worldwide.

The company designs and manufactures diesel turbochargers primarily for Cummins engine applications across passenger pickup, medium-duty, and heavy-duty Class-8 truck markets. Holset is unique among major OEM suppliers in concentrating exclusively on the Cummins relationship plus selected third-party heavy-duty diesel partners.

The relationship with Cummins is unique among major OEM turbocharger suppliers. Where Garrett supplies multiple OEM customers (Ford, GM, BMW, Mercedes, VW Audi), BorgWarner supplies multiple OEM customers (Ford EcoBoost, VW Audi 1.4T/1.8T/2.0T, GM Duramax), and IHI supplies multiple OEM customers (Subaru, BMW, Mercedes-AMG, Mitsubishi), Holset focuses exclusively on Cummins applications plus selected third-party heavy-duty diesel partners (Mack, Caterpillar selected engines, John Deere). The Cummins-Holset relationship is structurally tighter than the equivalent OEM-supplier relationships in the gasoline market.

"Holset HX35 is the gold standard for Cummins 5.9L 12-valve reliability. The factory units routinely reach 300,000-400,000 miles on stock builds with proper oil changes. Aftermarket compound builds use the same HX35 as the primary turbo because the factory unit is structurally over-spec for the 300-400 hp band; running it at 600+ hp in a compound configuration still gives 80,000-150,000 mile service life." — r/Cummins / r/cumminsforum synthesis on the Holset HX35 reliability benchmark across the 5.9L install base.

Holset Frame Families — Fixed-Geometry and VGT

The Holset catalog splits across two architectural families: fixed-geometry (HX-series) and variable-geometry (HE-series). Fixed-geometry covers earlier Cummins 5.9L applications plus all heavy-truck industrial; variable-geometry covers all 6.7L pickup applications and selected heavy-truck applications since 2007.

Fixed-geometry HX-series. HX35 on 1994-2002 Cummins 5.9L 12-valve P-pump injection and 1998-2002 24-valve VP44 injection (factory rating 230-400 hp). HE351CW (also fixed-geometry despite the HE prefix) on 2003-2007 Cummins 5.9L 24-valve common-rail. HX40 on Cummins ISL medium-duty applications. HX50 / HX52 on Cummins ISM and ISX heavy-truck variants. HX55 on largest Cummins ISX industrial applications. All HX-series ship journal-bearing standard with single-scroll or twin-scroll inlet configurations depending on application.

Variable-geometry HE-series. HE351VE on 2007.5-2012 Cummins 6.7L (OE 5354495 / 6411490 across Ram 2500/3500/4500/5500). HE300VG on 2013-2025 Cummins 6.7L (OE 5604175 / 5604180 / 6411519RX). HE400VG / HE451VE on Cummins ISX heavy-truck variable-geometry. The variable-geometry mechanism uses an electronic actuator to drive a unison ring that rotates moveable vanes through a 60-90 degree angular range, eliminating the spool-vs-peak compromise that the fixed-geometry HX-series forces on the designer. The architecture is documented in shop service manuals across the Cummins service network and in detail across the r/Cummins community.

Aftermarket Holset Cross-Shop Tiers

The Holset aftermarket cross-shop runs across three tiers. OEM-rebuilt direct from Cummins service at OEM warranty terms. Specialty-tier rebuilt Holset from Fleece Performance, BD Diesel, Industrial Injection, HPT, and Bullseye Power. Budget Chinese cross-reference from BuyAutoParts, ASDPI, Dofoch, and generic Amazon sources.

OEM-rebuilt direct: HX35 $1,200-$1,800, HE351CW $1,500-$2,000, HE351VE $1,800-$2,500, HE300VG $1,800-$2,500. Warranty: factory Cummins warranty terms (typically 12-month limited, 24-month on selected applications). Service life: documented OEM cohort range. Specialty-tier rebuilt: Fleece Cheetah HX35 ($2,500-$3,500 with documented dyno-proven Stage 2 upgrade), BD Diesel Killer B HX35 (similar pricing), Industrial Injection PhatShaft HX35 (similar pricing). Warranty: typically 12-month with specialty-tier claim-process documentation. Service life: comparable to OEM-rebuilt with slightly higher peak performance.

Budget Chinese cross-reference: BuyAutoParts 40-30796AN ($800-$1,300 for HX35 5.9L 12-valve cross-reference), ASDPI HE351VE / HE300VG ($800-$1,200), Dofoch HE400VG / HE451VE ($1,000-$1,500), generic Amazon sources at lower prices. Warranty: typically 1-year limited with heavier claim-process documentation. Service life: 30,000-80,000 miles on daily-driver applications. The 4-5× price gap between OEM-rebuilt and budget cross-reference maps to a 2-3× service life gap, similar to the cross-shop pattern at other turbo brands.

For Cummins 6.7L Ram owners specifically, the budget ASDPI HE351VE cross-reference makes a structurally defensible call at the 100,000-mile failure threshold where the buyer is replacing a worn OEM unit. The depreciation-adjusted spend math heavily favors budget aftermarket at that mileage and price point. For pre-warranty-expiry replacements or fleet-commercial work where uptime guarantees matter, OEM-rebuilt Holset is the right tier. For performance applications above stock spec, specialty-tier rebuilt Holset (Fleece, BD Diesel, Industrial Injection) is the documented community pick.

Holset vs Garrett / BorgWarner — The OEM Cross-Shop

Holset competes against Garrett and BorgWarner on heavy-duty diesel OEM applications. The decision pattern flips by OEM platform: Cummins applications run Holset; Ford 6.7L Power Stroke runs Garrett (GT3782VAS / GT3788LVA); GM Duramax runs BorgWarner / Garrett split depending on generation. The OEM cross-shop is therefore application-specific rather than head-to-head brand comparison.

For applications where multiple OEM suppliers fit (rare in heavy-duty diesel — typically the buyer\'s chassis determines the brand), the engineering depth is comparable across Holset, Garrett, and BorgWarner. All three publish compressor maps, ship documented balance certificates, and run extensive OEM-development partnerships with their respective engine makers. The differentiator for aftermarket buyers is OEM cross-reference fitment, distributor support in the buyer\'s region, and warranty terms — not raw engineering criteria.

For the diesel application context, the Read the diesel turbocharger buyer guide covers Cummins, Power Stroke, and Duramax install bases. For the VGT architecture that Holset HE-series uses, the Read the VGT architecture explainer covers the vane mechanism. For the compound twin-turbo applications that pair Holset HX35 primaries with BorgWarner S400 secondaries, the Read the compound turbocharger guide covers the architecture. For the broader cross-engine roundup, the Read the cross-engine roundup covers OEM-replacement picks across multiple chassis. For the OEM-spec replacement product review on the highest-volume Holset variable-geometry application, the Read the Holset HE351VE review covers the 2007.5-2012 Ram 2500/3500 install base directly.

For deeper engineering background, the Turbocharger reference covers compressor-and-turbine fundamentals. The Cummins Turbo Technologies technical library publishes Holset OE specifications and compressor maps. The Turbo University reference publishes industrial-tier balance-and-test discipline applicable to Holset rebuilds. The Turbocharger Rebuilding Distribution catalog publishes OE manifest cross-references for the Cummins / Holset install base.

Holset Decision Questions

Who owns Holset turbochargers?

Holset Engineering Co. (now formally Cummins Turbo Technologies, CTT) is a wholly-owned subsidiary of Cummins Inc. (NYSE: CMI). The brand was acquired by Cummins in 1973 and rebranded internally to CTT in 2006, though the Holset name continues across product labeling and aftermarket distribution. The company designs and manufactures diesel turbochargers exclusively for Cummins engine applications and selected third-party heavy-duty diesel partners.

What are the main Holset turbocharger models?

Holset HX35 (1994-2002 Cummins 5.9L 12-valve and 24-valve, fixed-geometry, journal-bearing, 230-400 hp band). HE351CW (2003-2007 Cummins 5.9L 24-valve common-rail, fixed-geometry). HE351VE (2007.5-2012 Cummins 6.7L, variable-geometry). HE300VG (2013-2025 Cummins 6.7L, variable-geometry, current generation). HX40 / HX50 / HX52 / HX55 industrial Cummins ISL / ISM / ISX heavy-truck applications, all journal-bearing single-scroll or twin-scroll configurations.

Are Holset turbochargers reliable?

Holset diesel turbochargers are the documented reliability benchmark in the heavy-duty diesel market. OEM HX35 and HE351CW on stock Cummins applications routinely reach 250,000-400,000 miles. HE351VE / HE300VG variable-geometry units reach 200,000-300,000 miles on the mechanical side; the actuator typically fails earlier at 100,000-180,000 miles. Industrial HX-series turbos on Class-8 truck duty cycles reach 500,000-1,000,000 miles between rebuilds. The Holset name carries documented community trust across decades of installed-base data.

Can you upgrade a stock Cummins to a bigger Holset?

Yes — Cummins 5.9L 12-valve owners commonly upgrade from stock HX35 to larger Holset HX40 / HX50 / HX52 frames for power gains in the 400-700 horsepower range. The upgrade path is well-documented in the Cummins community; Holset HX40 fits the same exhaust manifold flange as the OEM HX35 on most chassis. For 6.7L owners, the HE351VE → HE300VG generational upgrade is less common because the actuator wiring and ECM calibration differ; specialty rebuilders (Fleece, BD Diesel, HPT, Industrial Injection) cover the upgrade path with documented fitment kits.

Are Holset turbos interchangeable across Cummins engines?

Holset HX35 fits all Cummins 5.9L 12-valve and 24-valve applications with documented OE cross-references. HE351CW fits common-rail 5.9L 2003-2007 generation. HE351VE fits 2007.5-2012 6.7L; HE300VG fits 2013-2025 6.7L (HE351VE and HE300VG are NOT direct interchanges — different actuator calibrations and ECM compatibility). Industrial HX40 / HX50 / HX52 / HX55 cover specific Cummins ISL / ISM / ISX engine ratings; cross-engine compatibility requires verified OE cross-reference per application.

How much does a Holset turbo cost?

OEM-rebuilt Holset direct from Cummins service: HX35 $1,200-$1,800, HE351CW $1,500-$2,000, HE351VE $1,800-$2,500, HE300VG $1,800-$2,500. Specialty-tier rebuilt Holset (Fleece Cheetah HX35, BD Diesel Killer B HX35, Industrial Injection PhatShaft HX35): $1,500-$3,500 depending on Stage. Budget aftermarket Chinese cross-reference (BuyAutoParts, ASDPI, Dofoch, generic): $700-$1,500. Holset HX40/HX50/HX52 industrial: $1,500-$3,000 depending on application.

What is the difference between Holset HX35 and HE351CW?

HX35 covers 1994-2002 Cummins 5.9L 12-valve (P-pump injection) and 1998-2002 Cummins 5.9L 24-valve (VP44 injection). HE351CW covers 2003-2007 Cummins 5.9L 24-valve common-rail (CR injection). Both are fixed-geometry journal-bearing turbos at similar 230-400 hp factory ratings. HE351CW uses tighter wastegate calibration and slightly different turbine wheel sizing matched to the common-rail injection timing. The chassis cross-reference between the two is documented but requires verification per OE part number.