The Mercedes-Benz C63 AMG is one of the most celebrated performance sedans of its generation, blending brute force with German luxury. But for those who live at the track or simply crave pavement-shredding acceleration, the stock 451 horsepower (W204) or 503 hp (W205) quickly becomes a starting point. Adding a custom Roush supercharger can push the C63 well past the 600-horsepower mark, transforming an already thrilling car into a genuine supercar slayer. This article provides a detailed cost breakdown of that upgrade, covering every component from the blower itself to the labor, tuning, and supporting modifications required to achieve and sustain 600+ hp. Whether you are budgeting for a build or simply researching your options, this guide will give you a realistic picture of the investment involved.

Why a Roush Supercharger for the C63 AMG?

Roush has long been a respected name in forced induction, particularly for American muscle cars like the Mustang. However, their supercharger kits are also engineered for compatibility with certain Mercedes-Benz V8s, including the M156 and M177 engines found in the C63 AMG. Roush typically uses a twin-screw (positive-displacement) supercharger design, which offers immediate boost from low RPMs. This contrasts with centrifugal superchargers that build power higher in the rev range. For a daily-driven C63, the Roush roots-style blower delivers punchy, responsive torque that makes the car feel effortlessly fast around town while still pulling hard at higher speeds.

Key advantages include a relatively complete kit with tuning support, a reputation for reliability, and a more linear power curve that retains the stock engine character but with significantly more force. The supercharger is typically paired with an air-to-water intercooler system to manage intake temperatures, preserving power consistency during repeated pulls. For the C63 owner seeking above 600 hp without resorting to twin-turbo conversions or all-out engine builds, the Roush supercharger is a compelling option.

Cost Component 1: The Roush Supercharger Kit

The supercharger kit itself represents the largest single expense. For the C63 AMG, a Roush supercharger kit typically ranges from $6,000 to $8,000. This price includes the supercharger unit, intake manifold, intercooler system, drive belt and pulley assembly, fuel injectors, and a base calibration file. Some kits may also include a boost-a-pump or voltage booster to support higher fuel flow demands.

Several factors influence the final price:

  • New vs. used: A new kit from an authorized Roush dealer carries a warranty and latest revisions. Used kits can save $1,000–$2,000 but may lack updated components or tuning.
  • Model year compatibility: Kits for the W204 C63 (2008–2015) with the M156 engine are more common and slightly less expensive than those for the W205 (2015–2023) with the M177/M178 twin-turbo V8. For the W205, a supercharger is actually a twin-screw blower that replaces the turbos, so pricing can drift higher.
  • Included ancillaries: Some kits come with a larger intercooler heat exchanger, additional belts, or upgraded idler pulleys. Premium kits may also include a cold-air intake and a billet supercharger inlet.

For a reliable starting point, budget $7,000 for the kit. Always confirm that the kit is designed explicitly for the C63 AMG and includes a compatible tune. Popular retailers and Roush’s official site are good resources. Roush Performance provides a dealer locator and product details.

Cost Component 2: Professional Installation Labor

Installing a roots-type supercharger on a C63 is not a weekend DIY project for most enthusiasts. The process involves disassembling the front of the engine, removing the intake manifold, upgrading fuel injectors, fitting the supercharger assembly, and plumbing the intercooler system. A professional shop with experience in Mercedes performance will typically charge between $1,500 and $2,500 for labor.

Hourly rates at specialty shops average $120–$200 per hour, and the installation can take 10 to 18 hours, depending on the complexity of the kit and whether any supporting modifications are performed at the same time. If the shop charges $150/hour and the job takes 12 hours, expect $1,800. Additional charges may apply for custom fabrication if mounting brackets or coolant lines need adjustment.

It is highly recommended to use a shop that has installed Roush superchargers on Mercedes V8s before. Mistakes in belt alignment or intercooler plumbing can lead to belt slip, overheating, or power loss. Check forums like MBWorld for shop recommendations in your region.

Cost Component 3: Tuning and Calibration

A supercharger kit is only as good as the tune that controls it. Off-the-shelf tunes provided with some Roush kits are a starting point, but to safely achieve 600+ hp and optimize drivability, a custom tune is strongly advised. Tuning costs range from $500 to $1,000.

This price typically includes:

  • Initial dyno time (2–4 pulls or a full street tuning session).
  • Adjustments to fuel tables, ignition timing, and boost control.
  • Rev-limiter adjustments and throttle mapping.
  • Data logging checks for knock, fuel trims, and air/fuel ratios.

Some tuners offer remote calibrations using an SCT or CXRacing handheld tuner, which can be slightly less expensive but requires you to do data logging and send files back and forth. For the most reliable results, a dyno tune by a certified Mercedes tuner—such as Eurocharged or a local specialist—is worth the extra cost. A good tune ensures the engine does not run lean, which can cause detonation and catastrophic failure. Budget at least $750 for a quality custom tune.

Cost Component 4: Supporting Modifications

Simply bolting on a supercharger without upgrading related systems will limit power and risk reliability. To handle 600+ hp, the C63 needs stronger supporting components. These can add $1,000 to $3,000 to the total bill, depending on the parts chosen.

Exhaust System

The stock exhaust is restrictive. A set of catless downpipes or high-flow catalytic converters reduces backpressure and allows the engine to breathe. A full cat-back exhaust (3-inch or larger) further improves flow and adds aggressiveness to the sound. Cost: $500–$1,500.

Intercooler and Cooling Upgrades

The supercharger generates heat. An upgraded intercooler heat exchanger, larger coolant tank, and auxiliary electric water pump (if not included in the kit) keep intake air temperatures in check. Without proper cooling, the ECU will pull timing, and you will lose power. Cost: $300–$800.

Fuel System

At 600+ hp, the standard fuel injectors and fuel pump may run out of capacity. Many kits include larger injectors, but you may also need a boost-a-pump to raise fuel pressure. For the M156, upgrading the high-pressure fuel pump (HPFP) is sometimes necessary. Cost: $400–$1,200.

Clutch or Transmission Support (if manual)

For manual-transmission C63s, the clutch will require an upgrade to handle the increased torque. Expect to add $800–$1,500 for a heavy-duty clutch and flywheel. Automatic transmissions (AMG Speedshift MCT) generally hold the power, but a transmission tune or upgraded torque converter may be recommended. Cost: $500–$1,000.

Drivetrain and Tires

More power demands better traction. Wider rear tires (e.g., 305-section) and a sticky compound are necessary. A limited-slip differential upgrade (Quaife or Wavetrac) is not mandatory but helps put power down. Cost for differential: $1,500–$2,500 (if desired, but we include it as optional).

Detailed Cost Breakdown Summary

Below is a consolidated estimate for a 600+ hp Roush supercharger build on a C63 AMG. Prices are in US dollars and assume professional installation and supporting modifications.

  • Supercharger Kit (new, with intercooler and tune base): $6,000–$8,000
  • Professional Installation Labor: $1,500–$2,500
  • Custom Tuning (dyno + street calibration): $500–$1,000
  • Supporting Modifications (exhaust, cooling, fuel, clutch): $1,000–$3,000
  • Miscellaneous Hardware, Fluids, Contingency: $500–$1,000

Total Estimated Range: $9,500 – $15,500

This range covers the vast majority of builds. Some owners may achieve 600 hp with a budget kit and used parts for under $9,000, while those seeking a turnkey, no-compromise setup with all bells and whistles (new kit, premium exhaust, upgraded intercooler, transmission cooler, etc.) can easily exceed $15,000. The median build sits around $12,000.

Performance Gains: What 600+ HP Feels Like

With these modifications, the C63 AMG transforms from a fast sedan into a genuine performance machine. Typical outputs from a well-tuned Roush supercharger on a C63 are 600–650 horsepower at the crank and 550–600 lb-ft of torque. On the dyno, expect 520–560 wheel horsepower, depending on the specific model and drivetrain losses. The 0–60 mph time can drop from the stock 3.9–4.2 seconds to 3.3–3.5 seconds, rivaling supercars of the same era. The quarter-mile time may improve from the low 12s to the high 10s or low 11s at over 130 mph.

Equally important is the driving experience: the supercharger whine combined with the AMG V8’s growl creates an unforgettable soundtrack. Throttle response is instant, and the car pulls relentlessly from any speed. However, this power demands respect. Traction control will intervene aggressively in the wet, and the brakes should be upgraded (ceramic or larger rotors) if you plan to track the car regularly.

Reliability Considerations and Long-Term Costs

Adding 150+ horsepower to an already stressed V8 introduces additional heat and stress. Oil change intervals should be shortened (5,000 miles or less). The supercharger’s oil should be checked and changed per manufacturer guidelines (every 50,000–100,000 miles). The cooling system must be maintained meticulously; a low coolant level can cause overheating and power loss. Some owners report needing an aftermarket heat exchanger upgrade to keep IATs in check during hot summer days.

Also factor in potential drivetrain wear: the automatic transmission’s clutch packs may wear faster at higher torque levels. A transmission tune that raises line pressure can help. The rear differential on the W204 can be a weak point, so an upgraded LSD or cooling fins are worth considering. Budget an additional $1,000–$2,000 over the first two years for upkeep and potential repairs.

External Resources and Community Support

Before committing to a build, it is wise to read owner experiences on enthusiast forums. Two excellent resources are:

  • MBWorld C63 Forum (W204) – Extensive build threads, dyno results, and cost breakdowns from real owners.
  • BenzBoost – A dedicated Mercedes performance blog with supercharger installation guides and shop reviews.

These communities can provide specific advice on which Roush kit version is best for your year model and which supporting mods are essential.

Final Verdict: Is the Roush Supercharger Worth It for 600+ HP?

For the enthusiast who wants a visceral, high-horsepower daily driver or a track weapon, the Roush supercharger on a C63 AMG is an excellent investment. The cost of $9,500 to $15,500 is substantial, but when compared to buying a newer, faster car (like a 600-hp Audi RS7 or BMW M5), the supercharged C63 offers a unique combination of character, sound, and performance that is hard to replicate. It is a proven, reliable way to achieve 600+ hp without a full engine build.

That said, the upgrade is not for everyone. If you are not prepared to maintain a high-performance forced-induction system or are worried about resale value (modifications often lower trade-in value), you may be better served by leaving the car stock or opting for a less invasive tune. But if you have the budget and the desire, the Roush supercharger can turn your C63 into a monster that rivals cars costing three times as much. As always, consult with experienced tuners and shops, and do your research before handing over your keys and your credit card.