VTT B58 GC/GC+ Turbocharger Upgrade

VTT B58 “GC / GC-MID / GC+” Turbocharger Upgrades

Wheel Sizing / Power Support

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

• 100% new castings with factory restrictions removed — not stock housings with oversized wheels stuffed inside

• Full 3″ inlet with included 3″-4″ silicone elbow eliminating all OEM inlet restriction

• 9-blade Mar-M 246 turbine and 9-blade point-milled compressor wheel aero

• Improved bearing housing and upgraded thrust design

• Direct connection to factory oil, water, downpipe, and charge pipe

• No core charge — own your stock unit, sell it, or keep it

• Production units will be stocked for same / next day shipment (check availability)

• Full 12-month unlimited mileage / no-hassle replacement warranty

Package Includes

• 1x VTT B58 GC-Series Turbocharger

• 1x VTT 3”-4” silicone inlet elbow (with factory adapters)

• 1x 3″ inlet clamp

• 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.

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.

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.