VTT MQB Cast V2 “GC” Turbo Upgrade – G30-770/900

VTT MQB “GC” Turbocharger Upgrade – MQB IS20 / IS38 Platforms

GC (G30-770 spec / PTE ~58/60) – Rated up to 550WHP
GC+ (G30-900 spec / PTE ~62/62) – Rated up to 600WHP

Overview

Ready to take your MQB-powered platform to the next level—without core charges, long lead times, or restrictive factory housings? The VTT V2 “GC” Turbocharger Upgrade is a 100% new casting designed to maximize flow, durability, and power potential while retaining OEM fitment and fast spool.

We retained what works within the factory layout and eliminated what doesn’t: small inlets, restrictive turbo mufflers, undersized bearing architecture, and weak thrust design. The factory IHI CHRA is replaced entirely with our proprietary center section featuring a larger turbine shaft and robust journal bearing system—significantly stronger than anything found in IS20 or IS38 stock frames.

Combined with OE-quality castings, VTT geometry, and refined A/R ratios, the VTT GC platform delivers true drop-in performance capable of 550–600WHP+ depending on configuration and fueling.

Key Design Features

• All-New Castings purpose-designed for high flow (not oversized wheels in OEM housings)

• 310 Stainless turbine housing for maximum thermal stability / corrosion resistance

• 60mm 9-Blade Mar-M 246 Superalloy Turbine Wheel for high flow with fast transient response

• 71mm (GC) or 76mm (GC+) 9-Blade Point-Milled Compressor Wheels optimized for surge control and peak efficiency

• Direct OEM Fitment to all factory oil / water / downpipe / charge pipe connections

• 3” Full Flow Inlet & High Flow Outlet eliminating OEM muffler restriction

• Upgraded internals: 8mm turbine shaft, reinforced journal bearings, improved oiling, upgraded thrust

• Enlarged Wastegate Bore for improved boost control and reduced backpressure

• No Core Charge – brand new unit outright

• Ready to Ship – once fully released units will be stocked same/next day (confirm at order time)

• 12-Month Unlimited Mileage Warranty

Turbocharger Package Includes

• (1) VTT GC Turbocharger (G30-770 spec) or GC+ (G30-900 spec)

• (1) 3” Silicone Inlet Adapter

Recommended Supporting Modifications

While power gains are possible on stock hardware, full potential requires proper supporting mods: fuel upgrades, intake, downpipe, intercooler, and ECU tuning.

Warranty & Emissions Notice

These products are intended for competition / closed course racing only and are not legal for use on public highways (Calif. Health & Safety Code §39048). Use outside of sanctioned racing may result in penalties and will void applicable warranties. Verify compliance before installation.

• 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.