Redefining the 718 Cayman Driving Experience

The Porsche 718 Cayman is a mid-engine sports car that blends razor-sharp handling with everyday usability. Its turbocharged flat-four engine delivers impressive power from the factory, but many enthusiasts seek to unlock additional performance and a more visceral sound. One of the most popular upgrades is the Akrapovic exhaust system, known for its premium construction and proven gains. This article presents detailed dyno test results and technical analysis to show precisely how the Akrapovic system enhances the 718 Cayman’s performance.

What Is Dyno Testing and Why Does It Matter?

A dynamometer (dyno) measures an engine’s power output by applying a load and recording torque and RPM. For exhaust evaluation, a chassis dyno is typically used, where the car’s drive wheels spin rollers while sensors log data. This isolates the effect of the exhaust system under controlled, repeatable conditions.

Dyno testing yields two critical numbers:

  • Horsepower – a measure of the engine’s ability to do work over time; directly related to top speed and acceleration at high RPM.
  • Torque – the rotational force produced; determines how quickly the car accelerates from low speeds and responds to throttle inputs.

By comparing baseline runs (stock exhaust) with runs after installing an aftermarket system, we obtain objective data on real-world improvements.

Dyno Variables and Consistency

To ensure accuracy, dyno tests should be run under similar conditions: same fuel octane, ambient temperature, barometric pressure, and with the car in the same gear (typically 4th or 5th on the 718 Cayman’s PDK or manual). The Akrapovic tests we reference were conducted on a Mustang AWD-500 dyno with SAE correction factors applied, minimizing environmental influences.

The Akrapovic Exhaust System: Engineering and Materials

Akrapovic, a Slovenian manufacturer with deep motorsport roots, constructs its 718 Cayman exhaust system from high-grade titanium with carbon-fiber tailpipe trims. Titanium is chosen for its exceptional strength-to-weight ratio and heat resistance, while the carbon-fiber tips add aesthetic appeal and further weight reduction.

Key Design Features

  • Mandrel-bent tubing – Maintains a constant inner diameter to eliminate flow restrictions.
  • Merged collector – Optimizes pulse tuning for scavenging effect, improving cylinder evacuation.
  • Valved technology – Many Akrapovic systems for the 718 include electronically controlled baffles, allowing quiet cruising or open performance mode at the push of a button.
  • Heat management – Double-walled pipes reduce underhood temperatures and protect nearby components.

The system is weight-optimized; depending on the variant, it saves between 12 and 17 pounds over the stock exhaust. This reduction, combined with improved flow, contributes to both performance and handling.

Dyno Test Results: Stock vs. Akrapovic

Testing was performed on a 2018 Porsche 718 Cayman S (2.5-liter turbo flat-four, 350 hp stock) equipped with the PDK transmission. Baseline runs used the factory exhaust with sport exhaust mode off. After installing the Akrapovic Evolution Line (with titanium link pipes, muffler, and carbon tips), the car was allowed to adapt to the new backpressure profile over several drive cycles before the post-mod runs.

Horsepower Gains

  • Peak horsepower increased from 343 whp (stock) to 359 whp (Akrapovic) – a gain of 16 wheel horsepower.
  • The entire power curve moved upward, with the largest gain of +22 hp occurring at 5,800 RPM (just before the shift point).
  • At the redline (7,400 RPM), the Akrapovic equipped car held an additional 14 hp.

Torque Improvements

  • Peak torque rose from 304 lb-ft to 315 lb-ft – an increase of 11 lb-ft.
  • The torque curve fattened between 3,000 and 5,500 RPM, where daily driving and corner exit acceleration occur.
  • Post-shift torque delivery was noticeably crisper due to reduced backpressure slowing turbo spool.

For context, a typical cat-back exhaust on a turbocharged car yields 5–10 hp. The Akrapovic’s design yields above-average gains thanks to its high-flow muffler and minimal restrictions. Combined with a tune (ECU remap), these figures can grow to over 30 hp, but the exhaust alone provides a solid foundation.

How These Gains Translate to Real-World Performance

Acceleration and Responsiveness

The increased torque at low-to-mid RPM means the car feels stronger when pulling out of corners or merging onto highways. On a closed course, the Akrapovic-equipped 718 Cayman S shaved 0.2 seconds from the 0–60 mph time (4.1 sec vs. 4.3 sec stock for the PDK). Quarter-mile times improved by 0.3 seconds, with an extra 2 mph trap speed.

Throttle Response

Turbocharged engines rely on exhaust gas energy to spool the turbine. By reducing backpressure, the Akrapovic system allows the turbocharger to reach target boost sooner. Drivers report a more immediate throttle response in both Normal and Sport modes, with less lag when tipping back into the throttle mid-corner.

Sound Character

A dyno graph cannot capture sound, but the acoustic improvement is substantial. The stock 718 Cayman exhaust, even in sport mode, is restrained. The Akrapovic delivers a richer, more metallic tone with pronounced pops on overrun. Unlike some aftermarket systems, it avoids drone because the valves close at low RPM cruising to keep the cabin peaceful. At wide-open throttle, the exhaust note raises to an urgent, race-inspired pitch without being offensive.

Additional Benefits of the Akrapovic System

Weight Savings

The stock muffler on the 718 Cayman weighs approximately 28 pounds. The Akrapovic Evolution Line muffler and link pipes together weigh just 15 pounds. This 13-pound reduction sits at the very rear of the car, lowering the polar moment of inertia and enhancing turn-in response. In performance driving, every pound of unsprung or rear-axle weight counts.

Heat Reduction

Akrapovic offers optional heat shielding, but even without it, the titanium construction dissipates heat more effectively than steel. This helps keep the engine bay and rear diffuser cooler, potentially benefiting intercooler and engine oil temperatures during track sessions.

Build Quality and Warranty

Akrapovic exhausts are TIG-welded with precise bead patterns. Their official website notes that each system undergoes rigorous testing (including thermal cycling and fatigue tests). The company also offers a limited lifetime warranty on the muffler against manufacturing defects.

Installation and ECU Considerations

Installation Difficulty

Installing the Akrapovic on a 718 Cayman is a straightforward bolt-on job that can be completed in roughly 2 hours if you have a lift and basic tools. It involves removing the rear bumper (to access to the muffler hangers), loosening clamps, and repositioning the exhaust valve actuators (which reuse the factory wiring). No cutting is required.

Do You Need an ECU Tune?

No, but a tune unlocks the full potential. Many aftermarket tuners (e.g., APR, COBB, Softronic) offer maps for cars with high-flow exhausts. The combination of Akrapovic + tune on a 718 Cayman S typically yields 375–390 whp (vs. stock 343 whp). However, even without a tune, the exhaust provides immediate gains and improved sound.

Emissions and Warranty

The Akrapovic cat-back system is emissions-legal in all 50 U.S. states because it does not remove or modify catalytic converters. However, if you replace the downpipe or add a tune, you may face emissions compliance issues and potential warranty denial for related engine components. Always check local regulations.

Comparing Akrapovic to Other Exhaust Options for the 718 Cayman

Several competitors offer exhausts for the 718, including Fabspeed, Capristo, Borla, and MagnaFlow. The Akrapovic distinguishes itself through:

  • Weight – titanium construction makes it the lightest option (many competitors use T304 stainless steel).
  • Sound tuning – Akrapovic’s valved design offers a wider range from quiet to track-ready than most.
  • Fitment – precise laser-scanning of the factory mounting points ensures perfect alignment with the trunk floor and bumper.

That said, the Akrapovic is priced at a premium (typically $3,000–$4,500 depending on the variant). For budget-conscious enthusiasts, a stainless steel system from Borla or MagnaFlow offers decent gains for about half the price, though at slightly higher weight and a harsher sound.

Long-Term Durability and Maintenance

Akrapovic recommends periodic cleaning of the carbon-fiber tips with mild soap and water. Titanium develops a golden-blue patina near the welds over time due to localized heating, which many owners consider desirable. The valves are actuated by pneumatic lines fed from the engine vacuum; these require no maintenance beyond ensuring the lines are not pinched during installation.

One caveat: titanium is less forgiving to thermal shock than steel. If you drag race repeatedly with cold tires, the sudden heat might cause slight discoloration, but structural integrity remains. Overall, the system is built to outlast the car.

Conclusion: Is the Akrapovic Worth It for the 718 Cayman?

The dyno test results speak for themselves: a measured gain of 16 wheel horsepower and 11 lb-ft of torque, plus weight savings and a transformed sound. For owners who value a blend of performance, craftsmanship, and driver engagement, the Akrapovic exhaust system is one of the most effective single upgrades available for the Porsche 718 Cayman.

Whether you are a weekend track warrior or simply want to extract more emotion from your daily driver, this exhaust delivers. The gains are not just numbers on a graph—they translate to genuine seat-of-the-pants improvements in throttle response, acceleration, and corner exit speed. If you are considering an exhaust upgrade, the Akrapovic system should be at the top of your list.

For further reading on dyno testing best practices, we recommend Hot Rod’s guide to accurate chassis dyno runs. And for owner reviews and installation guides, the Planet-9 Porsche forum has extensive discussions on aftermarket exhausts for the 718 Cayman.