OEM-Style Variable Geometry Technology with Performance Upgrades
HE300VG and HE400VG turbos are variable geometry (VGT) upgrades designed specifically for 2007.5-2024 6.7L Cummins engines.
(2)
(0)
Unlike fixed-geometry turbos, VGTs use movable vanes to optimize boost across the entire RPM range—delivering quick spool at low RPM and strong top-end flow. Perfect for daily drivers, work trucks, and towing applications where maintaining emissions equipment and factory-like drivability is important.
Adjustable vanes optimize boost across RPM range
Works with EGR and DPF systems (where required)
Maintains tow/haul mode, exhaust brake, engine braking
Direct replacement for stock 6.7L VGT turbos
Key Differences: HE300VG is smaller frame (better spool, 350-450 HP), HE400VG is larger frame (more airflow, 450-550+ HP).
VGT = Variable Geometry Turbo. It has movable vanes inside the turbine housing that adjust based on engine load and RPM.
How VGT works:
Fixed-geometry turbo (S300, S400):
Why VGT for 6.7L Cummins? Factory uses VGT for emissions control, engine braking, and drivability. Upgrading to HE300VG or HE400VG gives you more power while keeping those factory features intact.
Yes, typically 100-175°F cooler than stock when towing similar loads.
Why VGT upgrades help with EGTs:
Real-world example:
Compare to fixed-geometry turbos:
For many 6.7L Cummins owners, VGT upgrades offer the best balance: significant EGT improvement while keeping all factory functionality.
HE300VG (Smaller Frame):
HE400VG (Larger Frame):
Quick decision guide:
Yes. HE300VG and HE400VG VGT turbos are widely used in towing and street-driven diesel applications because they provide fast response at low RPM while still flowing enough air for higher boost under load. When properly sized and tuned, these VGT turbos deliver smooth drivability, strong midrange torque, and reliable performance for daily driving, towing, and performance builds.
Yes—this is one of the main advantages of VGT turbos.
HE300VG and HE400VG turbos are designed to work with factory emissions systems:
Important for emissions-regulated states:
Note: While VGTs work with emissions equipment, you'll need tuning that's calibrated for emissions-on operation. Work with tuners familiar with emissions-compliant tuning for best results.
HE300VG:
HE400VG:
Supporting mods needed for these power levels:
VGT turbos aren't designed for extreme horsepower (700+ HP). For those goals, see our S400 Single Turbos or Compound Systems.
