The Ultimate 6.7L Cummins Upgrade: Why the Stainless Diesel 5Blade Mafia™ BOSS 63/67 Turbo Is a Best Seller!
The Ultimate 6.7L Cummins Upgrade: Why the Stainless Diesel 5Blade Mafia™ BOSS 63/67 Turbo Is a Best Seller!
For those that own a 2013–2018 RAM 2500 or 3500 with the 6.7L Cummins, you already know the factory turbocharger is notorious for stuck vanes, failing electronic actuators, and restricted exhaust flow under heavy loads. When it comes time to replace or upgrade, finding a turbo that balances everyday towing, fast spooling, high horsepower capability, and factory exhaust brake operation can feel impossible.
That’s where the Stainless Diesel VGT BOSS 63/67 5Blade Mafia™ really sets itself apart from the competition.
Out of all the Stainless Diesel turbochargers we carry here at D&J Precision Machine, the BOSS 63/67 is hands down our #1 best selling drop-in turbo! Whether you're hauling heavy trailers, looking for a performance street build, competing in pulling classes, or simply fixing your failed factory turbo, this turbocharger delivers everything you could ask for, without the headaches of custom fabrication.
What Makes the VGT BOSS 63/67 Special?
The secret behind the BOSS 63/67 lies in how Stainless Diesel engineered high end competition performance into a direct OEM bolt-on option.
1. The 63mm 5Blade Mafia™ Billet Compressor Wheel
Unlike standard multi-blade compressor wheels that chop up air into smaller slices, Stainless Diesel’s proprietary 5Blade Mafia™ billet design bites off larger chunks of air per revolution. This creates massive air volume and high density at lower boost thresholds.
- Faster Spool: Immediate boost build right off the line or when grabbing a gear while towing.
- Cooler EGTs: Massive reduction in Exhaust Gas Temperatures (EGTs) compared to stock.
- Signature Whistle: An unmistakable, aggressive turbo whistle that lets everyone know your Cummins means business.
2. High-Flow 67mm Turbine Wheel
To feed that 63mm compressor without creating excessive exhaust backpressure, the BOSS pairs it with a large 67mm turbine wheel.
- 10-Blade (Standard): Excellent balance of smooth exhaust flow, rapid response, and high-RPM stability.
- 9-Blade (Optional): Maximum exhaust flow for high-fueling builds and an even louder exhaust note.
3. Factory Fitment & Full Exhaust Brake Retention
One of the biggest concerns for 6.7 Cummins owners upgrading their turbo is losing the factory exhaust brake. The VGT BOSS 63/67 is built inside a stock-style housing. It bolts directly to your factory exhaust manifold and downpipe with zero custom fabrication required, and fully retains your OEM exhaust brake functionality for safe, controlled heavy towing.
4. Pre-Calibrated VGT Actuator Included
No guessing games or difficult electronic calibration required during setup. The BOSS 63/67 comes pre-fitted with a calibrated VGT actuator right out of the box, along with a complete installation gasket set, making it a true drop-in performance solution.
Quick Spec Breakdown
| Specification | Details |
|---|---|
| Compressor Wheel | 63mm Billet 5Blade Mafia™ |
| Turbine Wheel | 67mm High-Flow (10-Blade standard / 9-Blade option) |
| Power Capability | Supports up to ~700 HP with supporting fueling upgrades |
| Fitment | Direct Drop-In for 2013–2018 RAM 2500/3500 6.7L Cummins |
| Exhaust Brake | 100% Retained |
| Actuator | Includes calibrated electronic VGT actuator |
| Warranty | 2-Year Unlimited Mile Warranty from Stainless Diesel |
Performance: What You’ll Feel
Towing & Heavy Hauling
Stock turbos choke up when pulled hard uphill under heavy loads, driving EGTs into dangerous territory. The BOSS 63/67 lowers EGTs by expanding exhaust flow capacity while keeping the boost crisp at lower RPMs. Your truck works less, runs cooler, and keeps you safer when hauling heavy loads.
Daily Driving & Street Manners
Because it uses variable geometry technology (VGT), you don't suffer from the high RPM lag like large fixed geometry turbos. Throttle response feels quick and predictable while cruising around town, while still offering room to breath when you hit the highway.
Up to 700 Horsepower Potential
With appropriate tuning and fuel delivery (upgraded injectors/CP3), the BOSS 63/67 has supported builds pushing right up to the 700 HP mark—making it a perfect "sleeper" setup for street trucks and Work Stock diesel pulling classes.
Why Buy Your Stainless Diesel Turbo from D&J Precision Machine?
At D&J Precision Machine, we live and breathe high performance Cummins diesel engines. We don't just sell parts, we test, build, and support the products we carry. We proudly recommend the Stainless Diesel VGT BOSS 63/67 because it consistently delivers the reliability and performance our customers demand for their Cummins engines.
Ready to eliminate your stock turbo headaches and unlock your 6.7L Cummins' true potential?