



Upgrade your 6.7L Cummins with the Stainless Diesel 'VGT UNDERBOSS' 5Blade Mafia™ Turbocharger, designed as a true bolt-on replacement for your 2007.5–2012 model. Whether you're replacing a failing factory unit, aiming to meet Work Stock pulling rules, or just want to turn heads with a sleeper setup, the VGT UNDERBOSS is the power-packed solution your truck deserves.
Built around our larger 63mm billet 5Blade Mafia™ compressor wheel and paired with a high-flow 64mm 10 Blade turbine, this unit supports up to 650+/- horsepower while keeping exhaust brake functionality and daily drivability intact.
✅ Drop-In Replacement – No cutting, fabrication, or custom parts needed
✅ Maintains OEM Exhaust Brake Functionality
✅ 63mm 5Blade Mafia™ Compressor Wheel – Fast spool, big flow
✅ Optional 64mm 9Blade Turbine Wheel – High-flow, aggressive sound
✅ 650+/- HP Capable – With upgraded fueling
✅ Includes Calibrated VGT Actuator – Pre-set and ready to roll
✅ Lower EGTs – Keep things cool under pressure
✅ Great for Towing
✅ Includes Full Installation Gasket Set
✅ Optional Braided Stainless -4 Oil Feed Line
✅ Backed by a 2 year unlimited mile warranty!
⚠️ Note: This turbocharger is built for performance while still being tow-friendly. For best results, upgraded fueling is recommended.
Replaced a Fleece Cheetah that was only a few years old with the Underboss on my 2012 Ram 3500 dually. Power is smooth and EGT's are 200 degrees lower under load, went from over 1400 and having to back off with the fleece to maxing out at 1200 on a steady hill climb pulling a loaded 35' gooseneck without loosing speed at 65mph. Great unit for sure.
Great turbo great spool and performance. I wish I would of gotten one sooner
This is such a great product. Easy to install and plug and play. It came with everything you need for install. Truck is back on the road again thanks to Stainless Diesel. I highly recommend. Great service and fast shipping.
Thanks for subscribing!
This email has been registered!