Description
VTT B58 “GC / GC-MID / GC+” Turbocharger Upgrades
Wheel Sizing / Power Support
| Model |
Wheel Size (Comp/Turb) |
Stock Engine Power Range |
| GC |
54/55 |
Up to 600WHP |
| GC-MID (TU ONLY) |
54/60 |
Up to 650WHP |
| GC+ |
67/68 |
Up to 800WHP |
Ready to take your B58 platform to the next level—without core charges, long waits, or compromising spool? VTT has you covered. Our 100% new casting B58 GC-Series turbochargers (GC, GC-MID, and GC+) retain the OE packaging advantages while removing the factory airflow limitations and weak internal architecture.
We start by keeping what BMW did right, then eliminate every bottleneck we found: the restrictive factory inlet, inefficient bearing housing oiling, small thrust assembly, and anything else holding the B58 back. Then we incorporate proprietary VTT improvements and cast everything at full OE-level quality.
The result? Serious B58 power made simple. GC turbos are direct bolt-on upgrades that retain all factory connections (oil, water, charge pipe, downpipe) while supporting 600WHP+ — with factory-like spool.
Key Design Elements
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100% new castings with factory restrictions removed — not stock housings with oversized wheels stuffed inside
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Full 3″ inlet with included 3″-4″ silicone elbow eliminating all OEM inlet restriction
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9-blade Mar-M 246 turbine and 9-blade point-milled compressor wheel aero
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Improved bearing housing and upgraded thrust design
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Direct connection to factory oil, water, downpipe, and charge pipe
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No core charge — own your stock unit, sell it, or keep it
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Production units will be stocked for same / next day shipment (check availability)
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Full 12-month unlimited mileage / no-hassle replacement warranty
Package Includes
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1x VTT B58 GC-Series Turbocharger
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1x VTT 3”-4” silicone inlet elbow (with factory adapters)
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1x 3″ inlet clamp
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Optional 4″ connector for aftermarket intake compatibility
Notes / Fitment
-
GC inlet tube fits stock airbox and some aftermarket intakes with no modification. Some intakes (ex: Injen) may require slight modification or use of VTT MAF housing + filter.
-
This system removes the factory PTC heater. A shadow DME code will be present on scan tools, but in testing has not triggered a check engine light. This can be coded out if desired.
- The GC is Super Core ONLY, meaning no exhaust housing; this turbo plugs directly into your factory exhaust housing.
Recommended Supporting Mods
As with any turbo upgrade: fuel system upgrades, tuning, intercooler, downpipe, and intake are recommended to fully realize maximum power potential. Gains will still occur on a stock B58, but supporting mods unlock the true capability of each GC model.
