Unleash Your AMG GT’s True Performance

Transform your driving experience with EMP’s Stage 2 Performance Package—featuring our industry-leading ECU calibration and precision-engineered catless downpipes for the Mercedes-Benz AMG GT / GTS / GTC / GTR (C190 – M178). Developed by enthusiasts and tested in real-world conditions, this package delivers a dramatic increase in power, responsiveness, and sound.

Our Stage 2 ECU Tune pushes the M178 engine from the factory-rated 503 HP and 516 lb-ft to a thrilling 640 HP and 660 lb-ft of torque—with improved mid-range power and immediate throttle response. Paired with our free-flowing 3” stainless steel catless downpipes, you’ll experience explosive performance on both street and track.

Tuning Features:

• EMP-calibrated Stage 2 ECU software

• +137 HP / +144 lb-ft torque gains

• Enhanced throttle response and mid-range torque curve

• Top speed limiter removal

• Customizable features: pops, bangs, flames, octane-specific tuning

• CEL delete (for catless downpipes)

• Safe, reversible tuning — stock map is saved

• Developed specifically for the M178 platform

Remote Tuning Process:
After purchase, we’ll ship you an OBD II cable. You’ll plug into your vehicle and PC, and we’ll complete the ECU flash via AnyDesk remote session. Simple, fast, and effective.

EMP Catless Downpipes Features:

• 3” mandrel-bent piping for maximum exhaust flow

• One-piece design with OEM-style coupling for perfect fitment

• Laser-cut flanges and CNC-machined O2 bungs

• Crafted from low carbon 304 stainless steel

• TIG welded by certified professionals

• Bolt-on installation with no cutting or modification required

• Improved turbo spool, aggressive exhaust note, and reduced backpressure

• Flow-tested in CAD and validated on dyno

What's Included:

• Stage 2 EMP ECU Tune (Remote Flash Kit + Software)

• EMP Catless Downpipes (Pair)

• Necessary installation hardware

Performance Gains:

• Stock Output: 503 HP / 516 lb-ft

• Tuned Output: 640 HP / 660 lb-ft

• Gain: +137 HP / +144 lb-ft torque

Compatibility:

• Mercedes-Benz AMG GT (C190)

• AMG GTS / GTC / GTR (2015–2021)

• Engine: M178 4.0L Twin-Turbo V8

Why EMP?

✅ Built by enthusiasts for real-world results
✅ Safe, reliable, and dyno-proven tuning
✅ In-house developed & track-tested software
✅ Expert support every step of the way