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The Mercedes-Benz W213 E63 AMG occupies a unique space in the high-performance sedan world. It combines the everyday usability of a luxury E-Class with a hand-built 4.0-liter V8 biturbo engine and an advanced all-wheel-drive system. But for owners who crave more—more power, more aggression, more exclusivity—aftermarket tuning provides the answer. No name carries more weight in the Mercedes tuning sphere than Brabus. Their Stage 3 package transforms the already formidable E63 into a hyper-sedan that challenges purpose-built supercars. This article breaks down exactly what changes—and just how significant the gap is between the factory machine and a Brabus Stage 3 build.
The W213 E63: A Benchmark in Performance Sedans
When Mercedes-AMG introduced the W213 E63 in 2017, it set new standards for the segment. The car launched with a 4.0-liter V8 biturbo engine—codenamed M177—that delivered 603 horsepower and 627 lb-ft of torque in the E63 S trim. That allowed a 0–60 mph sprint of 3.3 seconds, matching or beating dedicated sports cars costing twice as much. The secret sauce was the 4Matic+ all-wheel-drive system, which could fully decouple the front axle for rear-wheel-drive “Drift Mode.” Coupled with a nine-speed multi-clutch automatic transmission and air suspension with adaptive dampers, the stock E63 S walked the line between luxury sedan and track weapon.
Competitors like the BMW M5 F90, Audi RS6, and Porsche Panamera Turbo all targeted the same buyer. Yet the Mercedes-AMG E63 earned a reputation for brutal acceleration, a refined interior, and surprising agility for a 4,400-pound sedan. Still, even at 603 horsepower, enthusiasts knew the engine had more to give. The block, heads, and internals were designed to handle significant power increases—and tuners like Brabus were ready to exploit that potential.
Stock W213 E63 Performance Deep Dive
Before we examine the tuning upgrades, it’s worth understanding exactly what the stock car delivers. The hand-assembled 4.0-liter V8 features twin-scroll turbochargers nestled inside the engine V, direct injection, and a cross-plane crankshaft. In the E63 S, peak power arrives at 5,750 rpm, while peak torque spans from 2,500 to 4,500 rpm. The nine-speed Speedshift MCT transmission uses a wet clutch instead of a torque converter, enabling lightning-fast shifts and smooth launches.
Acceleration and Speed
- 0–60 mph: 3.3 seconds (with rollout subtracted, many tests show 3.2)
- Quarter-mile: 11.3 seconds at 123 mph
- Top speed: Electronically limited to 186 mph (optional AMG Driver’s Package can raise this to 186 mph, factory limit for the S)
- Braking (60–0 mph): Approximately 108 feet
The stock E63 S feels effortlessly fast. The 4Matic+ system provides immense traction, allowing the car to rocket off the line without drama. In the real world, it’s more than enough for any public road. But the engine note—while characterful—is somewhat muted by sound regulations and the turbos themselves. That’s part of the appeal of Brabus: they not only unlock power but also give the car a voice.
Brabus Stage 3 Tuning: Engineering Beyond Factory Limits
Brabus has been modifying Mercedes-Benz vehicles since 1977, earning a reputation for extreme power and exquisite craftsmanship. Their tuning philosophy focuses on longevity and drivability, not just peak numbers. The Brabus Stage 3 package for the W213 E63 is their most popular offering for this chassis, delivering a substantial power bump without requiring internal engine modifications. It is designed for owners who want supercar-slaying performance that remains reliable enough for daily driving.
Key Modifications in Stage 3 Tuning
The Stage 3 kit from Brabus is more than a simple ECU flash. It is a comprehensive upgrade package that addresses airflow, fueling, and thermal management. Here are the primary components:
- ECU Remapping (Brabus B50 PowerXtra): The engine control unit is recalibrated through Brabus’s proprietary software. Boost pressure, ignition timing, fuel injection, and throttle mapping are all optimized. The remap is performed via the OBD-II port, so the original ECU is not modified—this preserves the ability to revert to stock if needed.
- Upgraded Turbochargers: Brabus replaces the factory turbos with larger, more efficient units featuring billet compressor wheels. These provide higher boost potential and improved airflow at all engine speeds. The new turbos are matched to the software calibration for safe operation.
- High-Performance Exhaust System: A stainless steel exhaust with free-flowing catalytic converters and electronically controlled flaps reduces backpressure and amplifies the V8’s naturally aggressive exhaust note. The sound is deeper, louder, and more resonant, especially under full throttle. The flaps allow the exhaust to remain civil for daily commuting.
- Enhanced Intercooling: Brabus installs a larger, more efficient intercooler to keep intake air temperatures low. Heat management is critical when pushing a twin-turbo engine to 800 horsepower; without proper cooling, the engine would suffer from knock and power loss. The upgraded intercooler reduces the risk of heat soak during repeated hard runs.
- High-Flow Air Intake: The Stage 3 package includes a revised air intake with high-flow air filters and smoother ducting. This reduces restriction and allows the turbos to spool more freely.
Optional upgrades include a Brabus carbon fiber engine cover, a sport air filter, and custom alloy wheels. However, the core performance comes from the ECU, turbos, exhaust, and cooling changes. It is worth noting that Brabus recommends running the car on premium 93-octane fuel (or higher) to achieve the stated numbers. International customers may need RON 98 or 100.
Power and Torque Gains
After installing the Stage 3 kit, the W213 E63 S produces a documented 800 horsepower at approximately 5,500 rpm and 738 lb-ft of torque from 2,500 to 4,500 rpm. That represents a gain of 197 horsepower and 111 lb-ft over the stock peak figures. However, the real-world improvement is even more dramatic because the torque curve is broader and arrives earlier. The stock car’s torque tapers after 4,500 rpm; the Brabus version holds peak torque longer and pulls harder all the way to redline.
On a chassis dynamometer, a stock E63 S typically measures around 530–550 horsepower at the wheels (depending on drivetrain losses). A Brabus Stage 3 car often records 680–700 wheel horsepower—a massive increase. This translates directly to acceleration.
Performance Metrics Comparison
Numbers only tell part of the story, but they help illustrate the scale of the transformation. Here is a head-to-head comparison based on independent testing by tuning magazines and Brabus’s published data.
| Metric | Stock E63 S | Brabus Stage 3 |
|---|---|---|
| 0–60 mph | 3.3 sec | 2.8 sec |
| 0–100 mph | 7.5 sec | 6.1 sec |
| Quarter-mile | 11.3 sec @ 123 mph | 10.5 sec @ 135 mph |
| Top speed (limited) | 186 mph | 199 mph (with Brabus speed limiter removal) |
| Braking 60–0 mph | 108 ft | 105 ft (with optional Brabus ceramic brakes) |
Note: The top speed of the Brabus Stage 3 car is normally limited to 186 mph unless you purchase their speed limiter delete and appropriate tires. The 199 mph listed is what Brabus claims for the car with high-speed-rated tires and their limiter removal. Acceleration benefits from the 4Matic+ system’s ability to handle the extra torque without spinning, though the launch control calibration remains similar to stock—just with more horsepower.
Quarter-Mile and Roll Races
The most telling test is the quarter-mile. Dropping from 11.3 to 10.5 seconds is a massive leap. In roll-on races from 40 mph or 60 mph, the Brabus car pulls brutally hard, often gaining several car lengths on its stock counterpart by 100 mph. This kind of performance puts the Stage 3 E63 in the same league as the McLaren 720S and Porsche 911 Turbo S, both of which cost two to three times as much.
Driving Experience: From Luxury Cruiser to Track-Ready Beast
Beyond the numbers, the way the car drives changes fundamentally. Here is a breakdown of the subjective differences.
Power Delivery and Throttle Response
The stock throttle mapping in the E63 S is smooth and progressive. In Comfort mode, the car feels subdued; in Sport+, it responds eagerly. The Brabus tuning sharpens throttle response across all driving modes. The larger turbos spool slightly differently—there is a very subtle increase in lag at low rpm, but once the boost builds, the shove is relentless. Brabus calibrates the software to minimize lag, so most drivers will not notice any delay. Below 2,000 rpm, the car feels similar to stock; above 3,000 rpm, it transforms.
Exhaust Note
Stock Mercedes-AMG V8s sound good but are restrained. The Brabus exhaust system with flap control gives the car a deeper, more aggressive bark at idle and a glorious roar under full acceleration. At partial throttle, it remains civilized enough for daily driving. The flaps can be controlled with a remote or via the AMG drive mode system. Cold starts are noticeably louder, which may not be to everyone’s taste, but it certainly announces the car’s presence.
Ride Comfort and Everyday Usability
Brabus does not change the suspension geometry or spring rates in the Stage 3 kit. The air suspension remains active and adjustable. As a result, ride quality is virtually identical to stock. The car can still be a comfortable grand tourer when set to Comfort mode. The increased power does not reduce refinement unless you choose to drive more aggressively. However, the optional Brabus lowering module (which drops the ride height by about 20 mm) can stiffen the ride slightly—most owners prefer the lowered stance for aesthetics and improved high-speed stability.
Handling and Chassis Dynamics
The stock E63 S handles very well for a heavy sedan, thanks to the 4Matic+ system’s torque vectoring and adaptive dampers. Adding 200 horsepower does not degrade handling, but it does demand more from the chassis under heavy acceleration. The all-wheel-drive system manages the extra torque admirably, but the front tires can struggle for grip in sharp turns if you are overly aggressive. Many owners upgrade to wider, stickier tires (e.g., Michelin Pilot Sport 4S or Cup 2) to keep everything planted.
Brabus offers optional forged Monoblock wheels in staggered widths—typically 9.0J front and 10.5J rear with 265/30/20 and 295/30/20 tires. Combined with the lowered ride height, this setup improves cornering grip and reduces body roll. But even without those options, the Stage 3 car remains stable and composed. The biggest change you will feel is in a straight line—the sheer acceleration can be overwhelming.
Braking Upgrades
With extra power comes extra responsibility. The stock braking system—six-piston fixed calipers front with 15.8-inch rotors—is excellent but can fade under repeated heavy use on a track or during spirited back-road passes. Brabus offers a ceramic composite brake upgrade with 16.5-inch front discs and ten-piston calipers. While optional, it is strongly recommended for anyone planning to exploit the full performance regularly. The ceramic brakes reduce unsprung weight and nearly eliminate brake fade.
Practical Considerations: Cost, Warranty, and Reliability
Brabus Stage 3 tuning is not cheap. The complete package including parts and installation typically costs between $25,000 and $30,000 depending on options and market. That includes the turbochargers, exhaust, ECU remap, intercooler, and intake. Installation is recommended by a certified Brabus dealer, though experienced independent shops can also do the work. Brabus offers a two-year warranty on their parts once installed by an authorized partner.
What about the factory Mercedes warranty? Installing any aftermarket performance parts will void the factory warranty for any related drivetrain failures. Brabus works closely with dealerships, and many dealers will still perform general maintenance under the standard E-Class warranty, but engine and transmission issues related to the tuning are covered only by Brabus. Buyers should factor this into their decision. That said, Brabus builds their kits with reliability in mind; the Stage 3 package does not push the engine past its structural limits. The M177 block and forged internals are the same used in the Mercedes-AMG GT and are designed to handle over 1,000 horsepower in racing applications.
Fuel Economy and Emissions
Fuel economy obviously suffers. The stock E63 S already consumes about 17 mpg combined. With Stage 3 tuning, expect 14–15 mpg if you drive normally, and single digits under hard driving. The upgraded exhaust system adds a slight smell of premium unleaded at idle, but it passes most emissions tests in regions where it is legal. Some areas (like California) may have issues with the removal of catalytic converters, so check local laws. Brabus offers a version with high-flow catalytic converters that maintain legal status in most European countries.
Is Brabus Stage 3 Tuning Worth It?
For the owner who wants a daily-driven sedan that can humiliate supercars on the highway or at the drag strip, the Stage 3 package is hard to beat. It transforms the E63 from a very fast luxury car into a genuine hyper-sedan. The driving experience becomes more visceral, the sound more thrilling, and the performance figures are among the best for any four-door car ever made.
However, there are alternatives. Renntech and Weistec offer competitive tuning packages for the W213 E63, sometimes at lower prices or with slightly different power characteristics. Brabus commands a premium because of the brand cachet, the comprehensive nature of the kit, and the additional warranty support. For some owners, that peace of mind is worth the extra cost. Others may prefer a simple ECU tune and a set of downpipes to achieve 700 horsepower for a fraction of the price.
Ultimately, the Brabus Stage 3 is aimed at enthusiasts who want a turnkey solution, backed by decades of Mercedes tuning expertise, and who value exclusivity. A Brabus-tuned E63 is instantly recognizable by the wheels, the exhaust tips, and the badges. It tells the world that this isn’t just any E63—it’s one of the fastest sedans on the planet.
Conclusion
The gap between a stock W213 E63 S and a Brabus Stage 3 is vast. Nearly 200 extra horsepower, a substantially shorter quarter-mile time, and a soundtrack that announces your arrival. Yet the car retains its core character: comfortable, luxurious, and sophisticated when needed, but savage when you want it. If you’re in the market for a high-performance sedan and have the budget to take it to the next level, Brabus Stage 3 is the benchmark.
For more information, visit Brabus’s official site to see the full kit details and pricing. You can also check Mercedes-AMG’s page for the E63 to refresh on stock specs. For an independent review of the tuning process and dyno results, Automobile Magazine has covered the Brabus E63 in depth.