Upgrading the exhaust system on your Mercedes‑AMG C63 with the M177 engine is one of the most effective modifications you can make. The Akrapovic exhaust system is renowned for its premium build quality, weight savings, and performance gains. This guide provides a detailed, step‑by‑step walkthrough of the installation process, along with the expected performance improvements and practical tips to ensure a trouble‑free upgrade.

Why Choose Akrapovic for Your C63 M177?

The Akrapovic exhaust system is engineered specifically for the Mercedes‑AMG C63 with the M177 V8. It uses high‑grade titanium and carbon fiber components to reduce weight significantly compared to the stock steel exhaust. The system is designed to optimize exhaust flow, which translates into measurable gains in horsepower and torque while delivering a more aggressive, refined exhaust note. Akrapovic’s reputation for precision fitting and durability makes it a top choice among enthusiasts who demand the best from their vehicle.

Before you begin the installation, it’s essential to gather all necessary tools, materials, and safety equipment. A clean, well‑lit workspace and a helper will make the job easier and safer.

Tools and Materials Required

  • Akrapovic exhaust system (complete cat‑back or turbo‑back depending on your kit)
  • Socket set (metric) with extensions and universal joint
  • Torque wrench (range of 20–60 Nm typical for exhaust hardware)
  • Flathead and Phillips screwdrivers
  • Pry bar or exhaust hanger removal tool
  • Penetrating oil (e.g., WD‑40 or PB Blaster)
  • Jack and two heavy‑duty jack stands
  • Safety goggles and gloves
  • Shop rags and a drip pan (expect some carbon buildup when disconnecting joints)
  • Optional: O2 sensor socket or 22mm wrench for sensor removal if relocating sensors

Always inspect the Akrapovic kit contents against the included checklist. Missing parts can delay the install, so confirm you have all gaskets, clamps, and hanger rubbers before starting.

Preparation Steps

Begin by parking the C63 on a level surface and engaging the parking brake. Allow the engine and exhaust components to cool completely if the car has been driven. Working on a cold system prevents burns and makes bolt removal easier as metal contracts.

Next, disconnect the negative battery terminal. While not strictly necessary for an exhaust swap, this prevents accidental electrical shorts or triggering fault codes when working near the oxygen sensors or wiring harnesses.

Lift the vehicle using a jack positioned at the factory jacking points. Place jack stands under the designated lift points on the frame rails or subframe. Never rely solely on the jack; always use stands. Double‑check that the car is stable before crawling underneath.

Removing the Stock Exhaust

With the car safely raised, inspect the underside to locate all exhaust hangers, brackets, and connection points. The C63 M177 has a dual‑mode exhaust with valves; note the actuator wiring and vacuum lines that may need to be disconnected.

Step 1: Disconnect exhaust valves and sensors

If your car is equipped with the factory active exhaust, unplug the electrical connectors to the valve actuators on each rear muffler. Use a small flathead screwdriver to release the locking tabs. Similarly, disconnect any oxygen sensor wiring – but you can often leave sensors installed in the downpipes if you are only replacing the cat‑back portion. For turbo‑back upgrades, you will need to unclip and remove the sensors using an O2 sensor socket.

Step 2: Loosen and remove clamps and bolts

Apply penetrating oil to all bolts and clamps that connect the exhaust sections – particularly the flange bolts at the downpipe connection and the clamps joining the mid‑pipes. Wait a few minutes for the oil to work. Using a socket and breaker bar, loosen the bolts but do not remove them completely yet. Support the exhaust system with a transmission jack or a helper to prevent it from dropping suddenly.

Step 3: Detach the exhaust hangers

The stock exhaust is held by rubber hangers mounted on metal brackets. Use a pry bar or a dedicated hanger removal tool to slide the rubber isolators off the exhaust studs. Work from the rear forward, supporting each section as you go. Take care not to damage the hanger brackets; you may reuse them or replace them with the new Akrapovic hardware.

Step 4: Lower the stock exhaust

Once all hangers and flanges are free, carefully lower the exhaust sections. You may need to remove the rear mufflers first, followed by the mid‑pipes, or lower the entire assembly as a unit depending on workspace. A helper is highly recommended to avoid scratching the body or bending the pipes. Set the stock exhaust aside; some owners choose to sell it or keep it for future reinstatement.

Installing the Akrapovic Exhaust

Before lifting the new system into place, dry‑fit the components on the floor to understand the routing and ensure all clamps and brackets are oriented correctly. The Akrapovic system uses high‑quality silicone‑sealed clamps and often includes step‑down adapters for a perfect fit.

Step 1: Prepare the mounting points

Clean the contact surfaces on the downpipe flanges and the hanger brackets with a rag. Apply a thin layer of anti‑seize compound to the bolts to prevent future corrosion, especially on titanium fasteners. If your Akrapovic kit comes with new gaskets, install them now.

Step 2: Assemble the exhaust sections

Begin at the downpipe connection. Slide the front section (often called the “Y‑pipe” or “front pipe”) onto the downpipe flange. Hand‑tighten the bolts, then gradually tighten them in a criss‑cross pattern to the manufacturer’s torque specification (typically around 30–40 Nm).

Attach the mid‑pipes next, using the supplied clamps. Do not fully tighten the clamps yet – leave them loose to allow adjustment. Connect the rear muffler sections, aligning the tips with the bumper cutouts. The Akrapovic system often features adjustable hanger brackets; use these to center the tips perfectly left‑right and up‑down.

Step 3: Secure all hangers and clamps

Reattach the exhaust hangers, ensuring each rubber isolator is fully seated. Once all sections are connected and the tips are aligned, tighten all clamps and bolts to the specified torque. Reconnect any valve actuators or vacuum lines if your Akrapovic system is equipped with exhaust valves. Some aftermarket systems delete the valves; in that case, you will need to install resistor plugs to avoid a check engine light.

Step 4: Final checks

Double‑check every connection – flanges, clamps, hangers, and wiring. Ensure no part of the exhaust contacts the chassis, driveshaft, or suspension. Spin the tips to make sure they are straight and symmetrical. Start the engine and listen for any exhaust leaks, especially at the flange joints and clamps. A small amount of smoke or condensation may appear during the initial warm‑up; this is normal. If you hear a persistent hiss, tighten the offending clamp slightly while the system is still warm.

Post‑Installation and Test Drive

Lower the vehicle to the ground and reconnect the battery. Clear any fault codes using an OBD scanner if you unplugged sensors. Start the engine again and let it idle until the exhaust system reaches operating temperature. The Akrapovic exhaust will typically sound deeper and more refined than the stock unit, but it may require a brief break‑in period (about 500 km) for the packing material to settle.

Take the car on a test drive over a mix of roads. Pay attention to:

  • Exhaust tone at idle, part throttle, and wide‑open throttle
  • Drone frequencies in the cabin (normal for some aftermarket systems, but should be minimal with Akrapovic’s design)
  • Performance feel – improved throttle response and power delivery
  • Dashboard warning lights (if any appear, check for a loose O2 sensor or valve connection)

If the check engine light illuminates, inspect the oxygen sensor connections and ensure all components are properly seated. Sometimes a simple reset is needed.

Performance Gains

Installing an Akrapovic exhaust on the C63 M177 yields several quantifiable benefits:

  • Horsepower and torque increases: Expect gains of 10–25 hp and 15–25 lb‑ft of torque at the wheels, depending on the specific system (cat‑back vs. turbo‑back) and whether the ECU is tuned.
  • Weight reduction: The Akrapovic titanium system can save up to 40–50% compared to the stock steel exhaust (approx. 20–30 lbs).
  • Improved throttle response: Reduced backpressure allows the engine to rev more freely, especially in the mid‑range.
  • Enhanced sound: A sportier, more aggressive exhaust note without being overly loud or droney when cruising.
  • Heat management: Titanium dissipates heat more efficiently than steel, which can help reduce underhood temperatures in the long run.

For maximum performance, many owners pair the exhaust with an ECU tune (e.g., from Eurocharged, Weistec, or RaceChip). A tune optimizes air/fuel ratios and ignition timing to take full advantage of the improved exhaust flow. Always consult with a reputable tuner before tuning, especially if you still have the factory warranty.

Maintenance and Long‑Term Care

Akrapovic exhausts require very little maintenance, but a few steps will keep them looking and sounding great:

  • Clean the tips regularly with a non‑abrasive metal polish to prevent discoloration. Titanium tips can bluish at high temperatures; this is normal and adds character.
  • Inspect clamps after the first 1000 km and re‑tighten if necessary. Thermal cycles can cause initial clamp loosening.
  • Check hanger rubbers for cracking or fatigue, especially in cold climates.
  • Avoid pressure washers directed at the exhaust valves or actuator motors – water damage can cause valve sticking.

If you live in an area with harsh winters, consider applying a light coating of anti‑corrosion wax (e.g., ACF‑50) to the exposed titanium and carbon fiber parts, though these materials are already highly resistant to corrosion.

Frequently Asked Questions

Will installing an Akrapovic exhaust void my warranty?

An aftermarket exhaust itself does not void the entire vehicle warranty, but Mercedes‑AMG may deny a claim if they can prove the exhaust caused a failure (e.g., an O2 sensor issue due to incorrect installation). Retain all stock parts and documentation.

Do I need a tune after installing the Akrapovic exhaust?

For a cat‑back system, no tune is required – the ECU adapts within normal parameters. For a turbo‑back (downpipe) system, a tune is strongly recommended to avoid check engine lights from the rear O2 sensors and to fully realize the power gains.

How long does the installation take?

A first‑time installer can expect 3–5 hours working alone. Professionals typically complete the job in 1.5–2 hours. Having a lift and a helper significantly reduces time.

External Resources

For further reading and technical details, consult these authoritative sources:

Final Thoughts

Installing an Akrapovic exhaust on your C63 M177 is one of the most rewarding modifications you can make. The combination of weight savings, increased power, and a sublime exhaust note transforms the driving experience. By following this detailed guide and taking your time during the installation, you will achieve professional‑grade results in your own garage. Whether you are a seasoned DIYer or a first‑time enthusiast, the effort is well worth the reward – your AMG will sound and perform exactly as it should.