Upgrade Your Cummins Without the Headache: Why the 5Blade Mafia™ UNDERBOSS VGT is the Ultimate Drop-In Turbo
If you drive a 2013–2018 6.7L Cummins Ram, you already know the story. You love the massive torque, the low end pulling power, and the exhaust brake reliability of the factory VGT setup. But the moment you start adding more horsepower or hooking up a trailer, the factory turbo starts running out of breath.
High drive pressures, rising EGTs, and decreased airflow are common frustration points for Cummins owners looking for more power output.
That is exactly why we designed the Stainless Diesel 5Blade Mafia™ UNDERBOSS VGT Drop-In Turbo (63/64), the ultimate performance upgrade that easily bolts right into your factory location without custom piping or headaches.
What Makes the UNDERBOSS Different?
Many aftermarket turbos force a compromise: either give up low end spool up for top end power by switching to a non-VGT fixed-geometry setup, or stick with a weak stock rebuild.
The UNDERBOSS eliminates that trade off. We took everything you love about VGT responsiveness and paired it with our proven 5Blade Mafia™ compressor technology to create a turbo that pulls hard from the bottom of the RPM band all the way through the top end.
Specifications & Features
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63mm Billet 5Blade Mafia™ Compressor Wheel: Engineered for maximum air density, faster spool times, and increased power capability over factory wheel designs.
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64mm 10-Blade Turbine Wheel: Reduces drive pressure and exhaust gas temperatures (EGTs) while maintaining strong exhaust brake performance.
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True Drop-In Fitment: Retains factory oil lines, coolant lines, intake, and exhaust flange setup for 2013–2018 Ram 2500/3500 models.
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Signature Stainless Sound: Delivers that unmistakable 5Blade Mafia whistle.
Performance Meets Daily Drivability
Whether you are towing a 15,000-lb camper through mountains or making a quick pass at the local drag strip, managing your airflow is critical.
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Performance Area |
Factory VGT |
Underboss 63/64 Upgrade |
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Airflow & CFM |
Restricted stock capacity |
Significantly higher volume to support tuned setups |
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EGT Control |
High under heavy load |
Substantially cooler exhaust temps under load |
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Spool Response |
Quick, but chokes early |
Instant VGT response with sustained top-end pull |
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Installation |
Factory stock |
100% Direct Bolt-On |
Is the UNDERBOSS Right for Your Truck?
The 63/64 UNDERBOSS VGT is ideal for truck owners who:
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Want more horsepower and lower EGTs without giving up the convenience of their factory exhaust brake.
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Demand a clean, OEM-style installation that doesn't require aftermarket manifolds, custom downpipes, or rerouted plumbing.
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Want the daily drivability of a stock turbo with the aggressive pull and unique sound profile of a Stainless Diesel unit.
Ready to unlock your 6.7L Cummins’ full potential? Check out the full specs and order your 5Blade Mafia™ UNDERBOSS VGT Turbo on StainlessDiesel.com today!