VTT 2013-2018 6.7 Cummins “GC” Turbocharger Upgrade

Description

Supported Power Level

GC Stock – 700 WHP

VTT 6.7 Cummins “GC” Turbocharger Upgrade

Ready to take your 6.7 Cummins to the next level without dealing with core charges, long lead times, or restrictive factory housings? VTT has you covered with our 100% new casting GC turbocharger upgrade.

We retained the best aspects of the factory Cummins turbo design while eliminating key limitations—such as outdated 12-blade turbine wheels, restrictive turbine housings, and cast compressor wheels. In their place, we’ve implemented modern aero advancements, including a billet cobalt VGT nozzle for increased durability and long service life.

Many assume the compressor wheel is the primary factor in power production. While it plays a role, the turbine wheel is the true driver of turbocharger flow and performance—including blade count, aero design, and efficiency.

By replacing the outdated 12-blade turbine with an advanced 9-blade Inconel turbine featuring modern aero and weight-reduction cutouts, the GC turbo delivers:

• Stock-like spool characteristics
• Significantly increased flow capacity
• Up to 700 WHP capability with proper supporting mods

We then take it further with proprietary VTT design enhancements and OE-quality castings, resulting in a true drop-in turbocharger capable of serious performance for towing, sled pulling, or street use—while maintaining factory fitment across all connections.

Key Design Elements

• All-new castings with factory restrictions eliminated (no oversized wheels forced into stock housings)
• 70mm / 62mm 9-blade Inconel turbine wheel with advanced aero for optimal flow and spool
• 90mm / 64mm 9-blade point-milled compressor wheel designed to maximize airflow and reduce surge
• Optimized turbine housing A/R ratio for improved efficiency
• Lower EGTs under load
• Billet cobalt VGT nozzle for enhanced durability and reliability
• Direct bolt-on compatibility with all factory connections (oil, water, downpipe, charge pipe)
• Redesigned internal components, including improved oiling and upgraded thrust bearing
• No core charge — keep or resell your original turbo
• No long lead times — production units intended for same- to next-day shipping (confirm stock at time of order)
• 12-month, unlimited mileage warranty — no-hassle replacement if issues arise

What’s Included

• (1) VTT 6.7 Cummins “GC” Turbocharger

Recommended Supporting Modifications

To fully realize the performance potential of the GC turbo, we strongly recommend pairing with:

• Fuel system upgrades
• Performance tuning
• Intake upgrades
• Downpipe and intercooler upgrades

While gains will be seen on a stock setup, maximum performance requires proper supporting modifications.

For best results, add a Cummins install kit to ensure a smooth, trouble-free installation.

Warranty

All VTT turbochargers include a 1-year limited warranty. Please review our full Warranty and Emissions Disclaimer at checkout for complete details.

Emissions / Legal Disclaimer

FOR COMPETITION USE ONLY

These parts are legal for use only in competition racing vehicles as defined under California law (Calif. Health & Safety Code § 39048). A competition vehicle is defined as one not used on public highways.

• These parts may only be used on closed courses in sanctioned racing events
• Vehicles equipped with these parts must not be driven on public roads
• Transportation to events must be via trailer or carrier

Use of these parts in non-compliant vehicles may result in:

• Fines and penalties under federal and/or state law
• Voiding of product warranty
• Voiding of vehicle manufacturer warranty

It is the purchaser’s responsibility to ensure compliance with all applicable laws. Vargas Turbocharger Technologies, Inc. assumes no liability for misuse.