What Is the HPE Performance Kit for the C63 M177?

If you own a Mercedes-AMG C63 with the M177 V8 biturbo engine, you already know it’s a beast. However, the HPE Performance Kit takes that twin-turbocharged 4.0-liter powerplant to a completely different level. Designed by Hennessey Performance Engineering, this kit is a comprehensive package of hardware and software upgrades aimed at extracting significantly more horsepower and torque while retaining everyday drivability. Unlike simple piggyback tuners or bolt-on parts, the HPE kit is engineered as a system where every component works in harmony. The result is a predictable, reliable increase in power that transforms the C63 from a fast luxury sedan into a genuine supercar contender.

The kit typically includes a high-flow air intake system, a less-restrictive exhaust component (often a midpipe or full cat-back), and a custom ECU calibration. Some versions also incorporate upgraded intercoolers or heat exchangers to manage the additional boost. While the specific parts may vary depending on the generation of your C63 (pre-facelift vs. post-facelift), the core philosophy remains the same: optimize airflow, reduce backpressure, and recalibrate fuel and ignition maps for maximum safe output. Hennessey’s reputation is built on tuning high-horsepower vehicles, and this kit is no exception.

Key Benefits of the HPE Performance Kit

Before diving into costs and procedure, it’s worth understanding exactly what you gain. The primary benefit is a substantial bump in power. Most C63 M177 engines come from the factory with around 469 to 503 horsepower depending on the variant (C63, C63 S, etc.). With the HPE kit, owners typically see gains in the range of 100 to 150 wheel horsepower, putting total output into the 600+ crank horsepower territory. Torque increases are even more impressive, often exceeding 650 lb-ft, which translates to brutal acceleration and effortless passing power.

Other benefits include improved throttle response, sharper engine sound (without drone or rasp), and increased reliability. Because the kit includes a proper ECU tune calibrated specifically for the hardware changes, you avoid the lean conditions or detonation that can occur with mismatched parts. Additionally, the upgraded intake and exhaust reduce heat soak, helping the engine maintain power during repeated pulls or track sessions.

Cost Breakdown: What to Expect

The total cost of the HPE Performance Kit for the C63 M177 varies based on where you buy it, whether you purchase the full kit or select individual components, and whether you have it professionally installed or do the work yourself. The original article mentioned a range of $3,000 to $5,000, but that requires updating for current market conditions and common configurations.

Component Pricing

  • HPE Performance Kit (full package): $3,500 – $5,500. This includes the intake, exhaust component, and ECU tune. Some retailers price the kit as a bundle at the lower end, while custom tuning or additional intercooler upgrades push it higher.
  • High-Flow Air Intake: $800 – $1,200 if purchased separately. The intake replaces the restrictive factory airboxes with larger filters and smoother intake tubes, reducing restriction and increasing air volume.
  • Exhaust System (midpipe or cat-back): $1,200 – $2,200 depending on material (304 stainless vs. titanium) and whether it includes a downpipe. The HPE kit often includes a midpipe that deletes the secondary catalytic converters or resonators, but full cat-back systems can be sourced separately.
  • ECU Tuning (custom flash): $800 – $1,500. This includes remote tuning or a handheld device. Some tuners offer in-person dyno tuning for an additional fee.
  • Additional Hardware (intercoolers, plugs, etc.): $200 – $800 if your specific C63 variant requires upgraded intercoolers or heat exchangers to support the tune.

Installation Costs

Professional installation at a reputable Mercedes-specialist shop or a performance garage typically ranges from $600 to $1,200 depending on labor rates in your area. The installation is not overly complex for a skilled mechanic, but it does involve removing the stock intake and exhaust components, which can be time-consuming on certain models. Some shops also charge extra for dyno-tuning if you opt for a custom calibration after the hardware is installed. DIY installation can save you most of that labor cost, but it requires a reasonable set of tools and mechanical confidence.

Hidden Costs to Consider

  • Software licensing: Some tuning solutions require a $100 – $200 license fee beyond the tune itself.
  • Shipping: If you buy the kit online, especially from a specialty tuner, shipping costs can add $50 – $150.
  • Supplies: New gaskets, clamps, or O-rings may be needed if the stock parts are reused. Budget $20 – $50.
  • Dyno verification: If you want to confirm power gains, a dyno session costs $75 – $150.

All told, a realistic all-in budget for the HPE Performance Kit installed professionally is $4,500 to $7,000. DIY installation can bring that down to $3,500 – $5,500.

Installation Procedure: Step-by-Step

Installing the HPE Performance Kit on your C63 M177 is a weekend job if you have the right tools and a clean workspace. The following guide assumes you are working on a lift or have jack stands and are comfortable with basic mechanical tasks. Always refer to the specific instructions provided with your kit, as component layouts vary slightly between 2015-2018 and 2019+ C63 models.

Tools and Supplies Required

  • Socket set (metric, 8mm to 18mm)
  • Torque wrench (capable of low to medium torque values)
  • Screwdrivers (flathead and Phillips)
  • Ratchet and extensions (including wobble joints for tight spaces)
  • Pliers (standard and hose clamp pliers)
  • Trim removal tools (for plastic clips)
  • Jack and jack stands or a lift
  • OBD2 flash tool (provided with the kit or purchased separately)
  • Gloves and safety glasses
  • Anti-seize compound (for exhaust bolts)
  • Threadlocker (medium strength for intake bolts if specified)

Phase 1: Preparation and Safety

Start by disconnecting the negative battery terminal. This is critical to prevent any electrical shorts and to allow the ECU to fully reset once the hardware is installed. Remove the battery cover and use a 10mm socket to disconnect the ground cable. Tuck it away so it cannot accidentally contact the terminal. Jack up the front of the vehicle and secure it on jack stands or a lift.

Remove the engine cover (it’s held on by push clips or bolts) to access the intake and top of the engine. Let the engine cool completely if it has been running recently–exhaust components get extremely hot.

Phase 2: Removing the Factory Intake System

The stock C63 intake consists of two large airboxes connected to the turbo inlets via rubber boots. Using a flathead screwdriver or a trim tool, carefully unclip the air filter housing covers. Remove the filters (they can be reused if you plan to keep them as spares). Loosen the hose clamps securing the intake ducts to the turbo inlets. Gently wiggle the airboxes free and remove them from the engine bay.

You will also need to disconnect the mass air flow (MAF) sensors and any secondary air injection hoses. Be careful not to damage the sensor wires. Set the factory intake aside.

Phase 3: Installing the HPE High-Flow Intake

Take the HPE intake components out of the box. The kit typically includes larger conical filters, fresh MAF sensor bungs, and CNC-machined intake tubes. Install the MAF sensors into the new housing using the supplied screws (apply a small amount of Loctite if recommended). Slide the intake tubes onto the turbo inlets and tighten the high-quality silicone couplers. Mount the filters onto the tubes and position them so they have clearance from the inner fender and engine components.

Reattach any vacuum hoses or PCV lines as specified in the kit instructions. Double-check all clamps are tight but not over-torqued (around 4-6 Nm).

Phase 4: Exhaust System Upgrade

The HPE kit usually includes a midpipe section that replaces the factory restrictive exhaust section between the downpipes and the rear muffler. This often involves removing the secondary catalytic converters or resonators, depending on your local emissions laws. Access the midpipe from underneath the car. Remove the exhaust heat shields if necessary. Loosen the bolts connecting the midpipe to the downpipes and the rear exhaust section.

Use penetrating oil if the bolts are rusted. Slide the old midpipe out and install the HPE midpipe with new gaskets (usually provided). Tighten the bolts to factory torque specifications (check your service manual for exact values, typically 20-25 Nm for exhaust flanges). If the kit includes a full cat-back exhaust, you will also remove the rear mufflers and install the HPE performance mufflers. Ensure all hangers are aligned and rubber isolators are in good condition.

Phase 5: Reassembly and Check

Once the intake and exhaust are in place, reinstall the engine cover (you may need to trim or modify it if the intake tubes are larger than stock). Reconnect all sensor connectors: MAF sensors, intake air temperature sensors, and any oxygen sensors that were unplugged. Visually inspect all hoses and clamps. Reconnect the battery negative terminal. Before starting the engine, perform a throttle relearn procedure if specified by the HPE instructions.

This often involves turning the ignition to the ON position (without starting) for 60 seconds, then turning it OFF for 10 seconds, then starting normally.

Phase 6: ECU Calibration

The heart of the HPE Performance Kit is the custom ECU tune. You will likely receive a handheld flasher device (like an HP Tuners MPVI2 or SCT X4) preloaded with the calibration file. Connect the device to the OBD2 port under the dash. Follow the on-screen prompts to read the original tune (as a backup) and then flash the HPE calibration. The process takes about 10-15 minutes.

Do not disconnect anything during the flash. After flashing, cycle the ignition OFF for 30 seconds, then start the engine. Let it idle for 2-3 minutes to allow the ECU to learn idle trims. Check for any warning lights on the dashboard. If the check engine light comes on, scan it with the flasher device to identify issues (often a loose MAF sensor or vacuum leak).

Post-Installation Validation

Once the engine is warm, take the car for a short test drive in a safe area. Start with gentle driving and listen for any unusual noises. Gradually increase throttle to verify smooth power delivery under boost. Do not perform full-throttle pulls until the engine has gone through several heat cycles. After 30-50 miles, check all hardware torque again, especially exhaust bolts and intake clamps.

If you have access to a dyno, a baseline run and a final run are excellent for verifying gains. Many tuners offer remote support; if you have hesitation or drivability issues, they can adjust the tune and send an updated file.

Common Installation Pitfalls

  • Vacuum leaks: Ensure all silicone couplers and hoses are fully seated and clamped. Even a tiny leak can cause a rough idle or lean condition.
  • MAF sensor contamination: Handle sensors carefully. Avoid touching the wire element. Oil from intake filters can sometimes coat the sensor; use a dedicated MAF cleaner if needed.
  • Exhaust leaks: Loose flange bolts or damaged gaskets produce a ticking sound and can reduce performance. Use new gaskets and torque properly.
  • Battery reset: Forgetting to reset the ECU after installation can result in suboptimal performance. Always disconnect the battery and perform a throttle teach when reconnecting.
  • Software compatibility: Ensure the tune file matches your exact C63 model, including transmission type (7-speed MCT vs. 9-speed automatic) and year. Flash the wrong calibration at your own risk.

Should You DIY or Hire a Pro?

The HPE Performance Kit is designed to be a moderate difficulty install. If you have experience swapping intakes and exhausts on modern German cars, you can handle it in a day. However, the ECU tuning step is the most critical, and a mistake there requires a recover or a shop visit. If you lack confidence, paying a professional $600-$1,200 for installation is worth the peace of mind. Many shops will also provide a warranty on their work.

If you choose DIY, invest in a quality torque wrench and follow the instructions to the letter. Online forums like MBWorld and the C63 AMG Forum are excellent resources for tips and troubleshooting.

Where to Buy the HPE Performance Kit

Purchase directly from Hennessey Performance Engineering for the most reliable source and to ensure you receive the latest calibration files. Other authorized dealers include European Auto Source and Vivid Racing. Avoid used hardware without a supporting tune, as the ECU calibration is often locked to the original vehicle. Always verify that the kit matches your C63’s year and transmission. The HPE product page provides a detailed overview of included components.

Final Thoughts

The HPE Performance Kit is one of the most well-rounded upgrades you can perform on a C63 M177. It addresses the three pillars of performance tuning—airflow, exhaust flow, and engine management—in a single, coordinated package. The cost is substantial but justified by the quality of components and the engineering behind the tune. Whether you install it yourself or have a shop do the work, the result is a car that feels significantly faster and more responsive without sacrificing daily usability. Just remember to budget for the tune and any potential dyno time, and always respect the power increase by upgrading your tires and brakes accordingly.

Your C63 will thank you with every prod of the throttle.