Garrett 934174-5011S G-XRace GXR55-91 XBoost Supercore 91mm/149mm Racing Turbo

Vehicle Fitment

• Universal - compatible with professional motorsport and drag racing applications on 3.0L-12.0L engine platforms; requires a compatible G-XRace GXR55 or G-Series G55 turbine housing

Fitment Notes

• Supercore only - a G-XRace GXR55 or G-Series G55 turbine housing is required and sold separately; available in V-Band and T6 inlet configurations across multiple A/R options
• G-XRace GXR55 turbine housings are interchangeable with G-Series G55 housings - enables a direct upgrade from a G55 supercore without changing existing exhaust hardware
• 91mm compressor inducer - mid-range option in the GXR55 lineup, sitting between the GXR55-88 and GXR55-94 for builds tuned to a specific compressor inducer class rule or power target
• Designed for professional motorsport and extreme drag racing competition - not for street use on public roads
• Speed sensor port machined into compressor housing - compatible with p/n 923586-0003 (G-Smart Bluetooth Module), 781328-0003 (street kit with gauge), or 781328-0004 (pro kit without gauge), all sold separately
• Maximum allowable turbocharger speed: 84 krpm - use above this speed is at owner's risk
• Not CARB legal - for competition and off-road race use only; not for sale in California

Features

• XBoost technology delivers +21% compressor flow versus the G-Series G55-1950 88mm baseline, with enhanced pressure ratio capability and improved efficiency at high airflow levels
• 91mm compressor inducer / 149mm compressor exducer - optimized for high-horsepower race builds requiring a specific inducer size within class rules
• Built on Garrett's G55 turbine frame: 112mm / 106mm Inconel turbine wheel delivering 15% more turbine flow than the GTX Gen II platform
• Lower intake temperatures via XBoost compressor efficiency for denser charge air and greater power potential at extreme boost levels
• Lightweight one-piece aluminum backplate reduces overall supercore weight
• Fully machined flange-style speed sensor port for turbo shaft speed monitoring and overspeed protection
• Compatible with all G-Series G55 and G-XRace GXR55 turbine housings - seamless upgrade path from G55 without changing exhaust hardware
• Designed for extreme drag racing, time attack, and other high-power competition motorsport applications requiring a 91mm inducer configuration

Specifications

• Part Number: 934174-5011S
• Series: G-XRace GXR55-91
• Compatible Engine Displacement: 3.0L-12.0L
• Compressor Inducer: 91mm
• Compressor Exducer: 149mm
• Turbine Frame: G55
• Turbine Wheel: Inconel, 112mm Inducer / 106mm Exducer (90 Trim)
• Technology: XBoost (+21% compressor flow vs. G55-1950 88mm)
• Center Housing: Lightweight One-Piece Aluminum Backplate
• Speed Sensor Port: Yes - Fully Machined Flange-Style (sensors sold separately)
• Max Turbocharger Speed: 84 krpm
• Compatible Turbine Housings: G-Series G55 / G-XRace GXR55 V-Band and T6 housings
• Sold As: Supercore Only (turbine housing not included)

Included Components

• 1x Garrett G-XRace GXR55-91 Supercore (91mm/149mm compressor, G55 112mm/106mm turbine wheel)
• Note: Turbine housing, speed sensor, and installation hardware sold separately

Product Description

The Garrett 934174-5011S is the GXR55-91 supercore from Garrett's G-XRace series - the 91mm inducer variant of the GXR55 platform, positioned between the GXR55-88 and GXR55-94 in the lineup. Built on the G55 turbine frame with XBoost compressor aerodynamics, it delivers +21% compressor flow over the G55-1950 88mm baseline, with enhanced pressure ratio capability and improved high-flow efficiency for extreme motorsport power levels. The 91mm compressor inducer / 149mm exducer configuration is particularly well-suited for race builds governed by a 91mm inducer class rule, or for builders dialing in a specific power band between the 88mm and 94mm inducer options.

This supercore is compatible with all G-Series G55 and G-XRace GXR55 turbine housings, making it a straightforward drop-in upgrade for builders already on the G55 platform. The G55 turbine stage - a 112mm/106mm Inconel wheel with 15% more flow than GTX Gen II - provides the exhaust energy extraction to support the GXR55's expanded compressor aero. A machined speed sensor port is included for optional shaft speed monitoring. Turbine housing, speed sensor, and installation hardware are sold separately.