Understanding the E63’s Twin-Turbo V8 Powerplant

The Mercedes-AMG E63 has long been a benchmark in the high-performance luxury sedan segment. Known for its brutal acceleration, refined interior, and all-wheel-drive grip, the E63 delivers an experience that few rivals can match. Under the hood, you’ll find a hand-assembled, twin-turbocharged V8—either the 5.5‑liter M157 (E63 2010–2013) or the 4.0‑liter M177/178 (E63 2014–present). While the factory tuning is impressive—typically producing 550–600 hp depending on the generation—many owners soon crave more. Turbo upgrades offer the most effective path to significantly higher output without sacrificing the engine’s everyday manners.

This article explores five of the most proven turbo upgrade solutions for the AMG E63. Whether you’re after a simple bump in power with the AMG Performance Package or a full track‑dominant build like the Hennessey twin‑turbo kit, you’ll need to understand your goals, budget, and supporting modifications. We also address a common point of confusion: none of these kits are designed for a hypothetical “3.0L twin‑turbo.” The E63 has always used a twin‑turbo V8, and the kits below are tailored specifically to those engines. For owners of the smaller E43/E53 (inline‑6) or C43 (V6), separate options exist—but this guide is focused on the true AMG V8 cars.

Before diving into the upgrades, remember that turbo swaps require matching fueling, engine management, and cooling upgrades. Any reputable tuner will provide a complete package that includes software calibration and supporting hardware. The results can be transformative: stage‑1 upgrades typically add 80–120 whp, while a full built‑engine, big‑turbo build can exceed 1,000 hp. Let’s examine the top five routes to unlocking that potential.

1. AMG Performance Package (Factory Upgrade)

The AMG Performance Package is the most OEM‑integrated option. It was offered as a factory option on many E63 models and includes optimized turbochargers, higher‑flow catalytic converters, and recalibrated ECU software. The turbos themselves feature revised compressor wheels and altered wastegate settings to produce slightly higher boost pressure across the rev range. Because the parts are designed and validated by Mercedes‑AMG, reliability and emissions compliance remain at factory levels.

Key Details

  • Power gains: Approx. 30–50 hp over standard E63 (varies by model year).
  • Hardware included: Turbochargers, downpipes, and ECU tune.
  • Warranty impact: Covered under Mercedes factory warranty if ordered from the factory; retrofits may affect coverage.
  • Installation: Can be performed by any AMG‑certified dealer.

Pros and Cons

The main advantage is peace of mind. The AMG Performance Package keeps every component inside the Mercedes parts catalog, and the calibration is exhaustively tested for durability. However, the power increase is modest compared to aftermarket options. If you plan to track the car frequently or want a dramatic street‑feel difference, this package may leave you wanting more. It’s best suited to owners who want a mild, reversible boost without stepping away from factory support.

For those considering this route, check your vehicle’s build sheet. Many E63 models already include the Performance Package. If not, sourcing the turbochargers and downpipes separately (part numbers available from Mercedes) and then having an independent AMG specialist flash the OEM Performance Package tune is a viable path.

2. Renntech Turbo Upgrade

Renntech is one of the most respected names in AMG performance tuning. Their upgrade for the E63 replaces the stock turbochargers with units featuring larger compressor housings, upgraded billet compressor wheels, and reinforced wastegate actuators. The result is a significant increase in airflow capacity without spiking EGTs or over‑speeding the turbos. Renntech pairs the hardware with a custom ECU flash that optimizes boost, timing, and fuel trims for the premium fuel available in the US.

Performance Claims

  • Horsepower: +150–180 whp on a 4.0L E63 S (reaching ~720 whp on 93 octane).
  • Torque: +200 lb·ft at the wheels, requiring transmission software updates on 9-speed MCT cars.
  • Spool characteristics: Slightly later boost onset (100–200 rpm), but improved top‑end pull to 6,500+ rpm.

Supporting Mods

Renntech recommends upgrading the intercooler system (a common weak point on high‑boost V8 AMGs) and fitting a higher‑flow fuel pump. The kit includes a high‑flow intake assembly and revised boost pipes. Installation is straightforward for a competent shop, and Renntech provides a one‑year warranty on parts. Many owners report that the car remains daily‑driveable, with smooth torque delivery in comfort mode.

The Renntech upgrade shines as a “stage 2” alternative that doesn’t require built internals. The factory pistons and rods in the M177 can handle up to about 750 whp reliably, and the Renntech tune stays within that safe margin while delivering punchy mid‑range. If you’re looking for a kit that transforms the car’s character without sacrificing civility, this is an excellent middle ground.

3. Brabus Turbo Kit

Brabus has been building extreme Mercedes for over 40 years. Their complete turbo upgrade for the E63 is part of a wider lineup that includes engine management, stainless steel downpipes, and special air filters. Brabus offers two tiers: the basic “B40‑550” (mild increase) and the full “B40‑800” kit that targets 800 hp from a 4.0‑liter V8. The hardware features patented “titanium‑aluminum” compressor wheels that reduce rotational inertia, allowing faster spool and reduced turbo lag.

Engineering Highlights

  • Dual‑flow wastegate design for precise boost control.
  • Ceramic ball‑bearing center sections for longevity.
  • Integrated heat shielding to protect adjacent components.
  • Optional carbon‑fiber intake plenum upgrade.

What to Expect

Installing the Brabus B40‑800 kit requires supporting fuel system upgrades (high‑pressure pump and injectors) and an upgraded intercooler. Brabus recommends their own ECU tune, which disables the factory torque limiter in lower gears. The result is seamless, authoritative acceleration from 3,000 rpm to redline. Keep in mind that Brabus products are priced at a premium—often 2–3 times the cost of competing kits—but they come with extensive validation and a 3‑year/100,000 km warranty in select markets.

Brabus is not for the budget‑conscious. But if you value exclusivity, engineering pedigree, and a turnkey solution that doesn’t require custom tuning, it’s hard to beat. The kit is also reversible, which helps resale value for collectors. Many owners report that the Brabus turbo upgrade makes the E63 feel like an entirely different animal—more akin to a bespoke hyper‑GT than a tuned sedan.

4. Hennessey Performance Twin-Turbo Kit

Hennessey Performance is synonymous with extreme builds, and their twin‑turbo kit for the E63 is no exception. Rather than simply swapping the factory turbos for larger units, Hennessey replaces the entire twin‑turbo system with a completely new, higher‑flow setup that includes a carbon fiber intake manifold, larger charge pipes, and uprated wastegates. This kit is designed for customers seeking 900–1,000 whp on race fuel.

Kit Components

  • Precision 62/66 billet compressor wheels.
  • 316L stainless steel exhaust manifolds with optimized pulse‑flow design.
  • TiAL 44 mm wastegates (dual).
  • 4.5‑inch downpipes with high‑flow catalytic converters (off‑road pipes available).
  • Coolant‑circulated intercooler with larger core.

Power Potential

On 93 octane pump gas, the Hennessey kit delivers around 850 whp with the included tune. With methanol injection or E85, the same hardware can clear 1,000 whp. However, such output requires strengthening the engine bottom end: Hennessey offers built shortblocks with forged pistons, billet rods, and upgraded main bearings. The transmission (9‑speed MCT) also needs upgraded clutches and a reinforced torque converter.

This is not a weekend project. Expect the entire build to take several weeks at an authorized Hennessey facility. The price tag is substantial—often $25,000–$35,000 for the turbo kit alone, plus the supporting engine work. For those who can afford it, the results are track‑dominating. The E63 becomes a supercar killer capable of 9‑second quarter‑miles while retaining full interior amenities.

5. AWE Tuning Turbo Upgrade

AWE Tuning takes a different philosophy: enhance the stock turbochargers with upgraded internals while keeping the factory housings for quick spool and OEM‑like drivability. Their “Stage 2 Turbo Upgrade” for the E63 replaces the stock CHRAs (center housing rotating assemblies) with upgraded units featuring larger diameter compressor wheels and high‑flow bearing cages. The housings are ported and polished to improve flow. The kit includes a unique “Boost Smart” solenoid that works with the factory boost control system.

Performance Balance

  • Power gain: ~100 whp on 93 octane; 120 whp with AWE tune.
  • Spool: virtually identical to stock—boost threshold unchanged.
  • Sound: slightly more aggressive turbo whine without being intrusive.
  • Emissions: compatible with stock catalytic converters (requires no downpipes).

Ideal Use Case

This upgrade is perfect for owners who want a noticeable power increase without the complexity or cost of a full turbo swap. The AWE kit is a direct bolt‑on that retains the factory manifold and downpipe configuration. It works especially well on prefacelift M157 cars where the stock turbos are known to develop wastegate rattle after 60,000 miles—upgrading the CHRAs effectively refreshes the system.

AWE’s support is exemplary. The kit comes with detailed installation instructions, lifetime warranty on the CHRA, and free support calls. Because the installation requires dropping the front subframe, allow about 10–12 hours of labor at a reputable shop. The result is a car that feels genuinely livelier in the mid‑range while remaining docile in traffic. For many, that’s the sweet spot.

Choosing the Right Kit for Your E63

Now that we’ve surveyed the top five options, how do you decide? First, identify your goal. Do you want a mild, warranty‑friendly boost (AMG Performance Package)? A reliable daily‑driver upgrade (AWE or Renntech)? Or do you plan to build the engine for maximum power (Hennessey or Brabus)? Each path has different requirements for supporting modifications and budget.

Key Considerations

  • Fuel: E85 requires compatible fuel system components; some kits assume 93 octane.
  • Transmission: Above 700 whp, the 9‑speed MCT needs clutch pack upgrades.
  • Cooling: Larger turbos produce more heat; upgrade to a larger aluminum radiator and oil cooler.
  • Installation: Full turbo swaps often require removing the engine; budget for 20–30 hours labor.
  • Emission compliance: Not all kits have CARB EO numbers; check local laws.

We also recommend reading owner reviews on forums like MBWorld or AMG Private Lounge. Independent dyno sheets from reliable shops can reveal real‑world data that differs from marketing numbers. And always choose a tuner who works with your specific ECU generation (M157 vs. M177) to avoid communication issues.

Final Thoughts

Upgrading the turbochargers on your AMG E63 is the single most effective modification for unleashing its full performance potential. Whether you go with a factory‑sourced Performance Package, a bolt‑on CHRA upgrade from AWE, or a full monster kit from Hennessey, the results can transform your driving experience. Each kit in this list has been proven on the street and track, and each serves a specific owner profile.

Before making a purchase, consult with a professional tuner or AMG‑specialist shop. They can inspect your car’s current health, recommend necessary supporting mods, and ensure the kit is installed correctly. Remember that with great power comes greater responsibility—upgrade your brakes, tires, and suspension accordingly. With the right choices, your E63 will not only be faster but more rewarding to drive every day.

For further reading, visit the official websites: Renntech, Brabus, Hennessey Performance, and AWE Tuning. For factory options, check your local Mercedes‑Benz dealer’s AMG catalog.