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We retained the best aspects of the factory Cummins turbo design while eliminating key limitations—such as outdated 12-blade turbine wheels, restrictive turbine housings, and cast compressor wheels.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By replacing the outdated 12-blade turbine with an advanced 9-blade Inconel turbine featuring modern aero and weight-reduction cutouts, the GC turbo delivers: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.