Overview: The BMW M2 Competition and the Pursuit of More Power

The BMW M2 Competition remains a benchmark in the compact performance coupe segment. With its S55 twin-turbo inline-six engine derived from the M3 and M4, the car delivers 405 horsepower and 406 lb-ft of torque from the factory. While that output is already impressive, the engine is widely regarded as having significant untapped potential. The stock exhaust system, designed to meet noise regulations and reduce weight, often restricts flow and sound character. For owners looking to unlock a sharper throttle response, a more visceral exhaust note, and measurable horsepower gains, aftermarket exhaust systems are one of the most effective first modifications. Among these, the Akrapovic exhaust stands out as a premium option that consistently delivers 15–20 wheel horsepower gains.

Understanding the S55 Engine and Stock Exhaust Limitations

The S55 powerplant features a closed-deck block, forged internals, and twin mono-scroll turbochargers. Its exhaust manifold design is integrated with the cylinder head, which helps spool the turbos but also creates a natural bottleneck downstream. The stock exhaust uses a combination of restrictive catalytic converters, a Y-pipe with intermediate resonators, and a rear muffler that prioritizes silencing over flow. On a dyno, the stock exhaust shows a noticeable plateau around 5,500 rpm as backpressure limits top-end breathing. This is where an aftermarket system like Akrapovic makes its mark.

Why Upgrade the Exhaust on a Turbocharged Engine?

Unlike naturally aspirated engines where exhaust upgrades primarily affect sound, on a turbo car the exhaust system directly influences turbine efficiency. Reducing backpressure allows the turbos to spool with less resistance, improving low- and mid-range torque. The S55 benefits particularly well from this, as the stock exhaust’s constriction can cause boost to taper earlier than necessary. A freer-flowing exhaust not only unlocks top-end horsepower but also sharpens throttle response across the rev range.

Akrapovic Exhaust Options for the BMW M2 Competition

Akrapovic offers two main exhaust configurations for the F87 M2 Competition: the Slip-On system and the Evolution system. Both are crafted from titanium; the Evolution version adds a downpipe section for even greater flow.

Slip-On Titanium Exhaust

The Slip-On replaces everything from the catalytic converters back. It includes titanium Y-pipes, a titanium rear muffler, and a full set of titanium exhaust tips. Akrapovic’s “valve gate” system retains the factory electronic exhaust flap functionality, giving the driver control over sound level. This system typically weighs 22–25 pounds less than the stock steel exhaust—a meaningful reduction in unsprung weight.

Evolution Titanium Exhaust

The Evolution system adds a pair of resonance-free downpipes that replace the stock catalytic converters and secondary cats. This is the full “exhaust-to-back” solution. The downpipes are also titanium and feature Akrapovic’s proprietary internal design to minimize restrictions. The Evolution system results in the highest power gains—up to 20 HP and 18 lb-ft at the wheels according to Akrapovic’s own dyno data. However, it requires a tune to avoid check engine lights from the missing catalysts and produces a more aggressive sound.

Measurable Performance Gains and Dyno Results

Independent dyno testing confirms Akrapovic’s claimed numbers. On a typical Mustang or Dynojet chassis dyno, the Slip-On system adds approximately 10–12 wheel horsepower and 10–15 lb-ft of torque. The Evolution system pushes gains to 18–22 wheel horsepower and a corresponding increase in torque between 3,500 and 6,500 rpm. Peak gains occur at higher RPMs where the stock exhaust backpressure is most restrictive.

Real-world impact: A 20 HP increase on a 3,400-pound car yields a power-to-weight improvement of roughly 5%. In terms of acceleration, that can translate to 0.2–0.3 seconds off a 60–130 mph run. Combined with a quality ECU tune, some owners have seen the Evolution system push the M2 Competition to over 500 horsepower at the crank.

Weight Reduction and Materials Engineering

Akrapovic uses grade 9 titanium alloy for its muffler bodies and tubing, with CNC-machined inlet and outlet flanges. Titanium is roughly 40% lighter than the stainless steel used in the stock exhaust while offering superior heat resistance and corrosion resistance. The total weight savings for the Slip-On system is around 11 kilograms (24 pounds). The Evolution system saves an additional 6 kilograms from the downpipes. This reduction in unsprung mass improves suspension response and load transfer, particularly on track environments.

Sound Character and Technology

One of the primary reasons owners choose Akrapovic is the sound quality. The stock exhaust is muted and lacks definition; the Akrapovic exhaust delivers a deeper, more metallic tone without excessive drone. Akrapovic engineers use computational acoustics to tune the muffler chambers, controlling resonance frequencies. The result is a sound that is aggressive under full throttle yet civil during cruising. The valve system opens at higher RPM or when Sport+ is selected, providing a sharp increase in volume. It is worth noting that the Evolution system with downpipes dramatically increases volume and introduces a distinctive “turbine whine” from the turbochargers, which some enthusiasts love.

Installation Process: A Step-by-Step Guide

Installing the Akrapovic Slip-On system is a moderate DIY job that requires basic mechanical skills and tools. The Evolution system is more complex due to downpipe replacement and requires lifting the car higher and potentially dealing with tight space near the turbo outlets.

Tools Required

  • Metric socket set (10mm, 13mm, 15mm, 18mm)
  • Torque wrench (range 10–60 Nm)
  • Jack and jack stands (or lift)
  • WD-40 or penetrating oil
  • Safety glasses and gloves
  • Flat-blade screwdriver or trim tool (for O2 sensor removal)
  • Anti-seize compound

Installation Steps for Slip-On System

  1. Preparation: Park on level ground, engage parking brake, disconnect the battery negative terminal to avoid electrical shorts.
  2. Lift vehicle: Raise the car and place jack stands securely under lift points. Leave room to access the center section and muffler area.
  3. Remove stock exhaust: Spray penetrating oil on all rubber hangers and bolts. Using a 13mm socket, unbolt the Y-pipe from the catalytic converters. Unclip the rubber hangers using a flat screwdriver. Lower the stock exhaust system carefully.
  4. Transfer oxygen sensors (if applicable): On the Slip-On system, the stock O2 sensors remain in the factory location. If you are also installing downpipes, sensors will need to be transferred to the new piping.
  5. Mount the Akrapovic system: Position the rear muffler first, then attach the Y-pipes. Use the provided Akrapovic clamps; do not tighten fully until alignment is complete.
  6. Align tips and flaps: Adjust the titanium tips so they are centered in the bumper cutouts. Reconnect the valve actuator wiring.
  7. Tighten all fasteners: Torque clamps to Akrapovic’s specified values (usually 6–8 Nm for clamp bolts, 25 Nm for muffler hanger bolts).
  8. Lower car and test: Start the engine, let it idle, and inspect for leaks. Rev the engine and listen for abnormal rattles. Drive gently and re-check clamp tightness after 50 miles.

Pro tip: For the Evolution system, the downpipes require removal of the heat shields and have limited clearance. Many owners choose to have a shop perform this portion due to the risk of stripping bolts on the turbocharger outlet flanges. Expect 2–4 hours for a Slip-On install; full Evolution install may take 4–6 hours.

Complementary Upgrades to Maximize Gains

While the Akrapovic exhaust alone provides a solid bump in power, combining it with other modifications yields the best results. An ECU tune that adjusts fuel maps, boost pressure, and ignition timing can unlock another 30–50 horsepower. Popular tuning options for the M2 Competition include BootMod3, MHD, and Dinan. An upgraded intercooler and high-flow intake will further reduce intake air temperatures and allow the engine to sustain higher boost levels. Together, these modifications create a synergistic effect that elevates the M2 Competition into true supercar-challenging territory.

Maintenance, Warranty, and Drone Considerations

Akrapovic titanium systems are nearly maintenance-free. The titanium does not rust, and the welds are TIG-welded by master welders. However, the exhaust tips may discolor over time from heat; this is cosmetic and can be polished with non-abrasive metal polish. Regarding warranty: replacing the entire exhaust may void the factory warranty on the exhaust system itself but should not affect other powertrain components unless a failure is directly linked. Akrapovic Evolution downpipes require a tune to clear check engine lights from catalyst efficiency codes, which will likely void the engine warranty. Drone: The Slip-On system has minimal drone—less than many aftermarket exhausts due to its carefully designed resonance chambers. The Evolution system has more drone at certain cruising RPMs, particularly around 2,500–3,000 rpm. Adding sound deadening or aftermarket muffler inserts can help, but most owners accept it as part of the aggressive character.

Comparison with Other Premium Exhaust Systems

Other notable exhaust options for the M2 Competition include the Remus Race, AWE Tuning Track Edition, and MP Has (M Performance exhaust). While the Remus and AWE offer good gains and sound, the Akrapovic stands out for its titanium construction (lighter than stainless steel), its compatibility with the factory valve system (preventing warning lights), and its dyno-verified horsepower claims. The Akrapovic comes at a premium price, but the build quality, weight savings, and resale value justify it for serious enthusiasts. Independent reviews consistently rank it as the top exhaust for the platform.

Final Verdict: Is the Akrapovic Exhaust Worth It?

For the BMW M2 Competition owner seeking a direct, high-quality path to 15–20 wheel horsepower, a richer sound, and noticeable weight reduction, the Akrapovic exhaust is an excellent investment. The Slip-On is ideal for those who want a plug-and-play upgrade without tuning, while the Evolution system appeals to track-focused drivers who plan to tune their car and want maximum output. The cost may be high, but the engineering and craftsmanship are second to none. Combined with a reputable tune and supporting mods, the M2 Competition transforms from a great driver’s car into a truly exceptional performance machine.

For more information on Akrapovic systems and dyno charts, visit Akrapovic’s official product page. For community dyno results, refer to this BimmerPost thread with extensive member feedback.