Akrapovic 991.2 Carrera Exhaust: Titanium Slip-On

The Akrapovic 991.2 Carrera exhaust lineup is built around one goal: extracting the full acoustic and engineering character of the second-generation, twin-turbocharged 911 without compromising its everyday usability. This guide covers the Akrapovic systems available at NLP Performance for the 991.2 chassis — the 2016–2017 Porsche 911 Carrera S, Carrera 4, Carrera 4S and Carrera GTS — all of which share the same 3.0L turbocharged flat-six platform. At the center is the titanium Slip-On Line, supported by a pair of hand-laid carbon-fiber rear diffusers that complete the package both visually and aerodynamically.

What Akrapovic offers for the 991.2 Carrera

When Porsche moved the 991.2 Carrera to forced induction in 2016, the standard exhaust note softened compared to the naturally aspirated cars that came before it. Akrapovic answered with a focused set of components engineered specifically for the turbocharged platform. For the Carrera S, 4, 4S and GTS, the range at NLP Performance centers on the flagship titanium Slip-On Line and is rounded out by two cosmetic-and-aero upgrades: a high-gloss carbon-fiber rear diffuser and a matte carbon-fiber rear diffuser.

The logic is straightforward. The Slip-On Line is the performance and acoustic heart of the build — it replaces the rear muffler section while leaving the factory catalytic converters in place, so the car stays street-friendly and easy to live with. The carbon diffusers are the finishing layer, dressing the rear valance to match the new tailpipes and trimming weight at the very back of the car. Together they form the cohesive, factory-grade look that Akrapovic is known for.

The flagship: Slip-On Line (Titanium) — material, tips, construction

The Slip-On Line (Titanium) with titanium tips is the hero of this platform. It is crafted from high-grade, heat-resistant, ultra-lightweight titanium alloy, the same family of materials Akrapovic refines through its own foundry and motorsport program. The titanium muffler body is finished with two beautiful tailpipes that bolt directly to the factory mounting points, so the system installs as a true slip-on replacement for the rear of the OE exhaust.

Because it is a Slip-On Line rather than a full Evolution or Race Line system, it preserves the original catalytic converters and mid-pipe. That keeps the install simple and retains emissions hardware, while the redesigned muffler internals and titanium tailpipes do the work of freeing up the boxer’s voice. Akrapovic also offers an optional stainless-steel link pipe set for this platform that can be added to further sharpen sound and flow for owners who want to push the system further.

The tailpipe tips on this configuration are titanium, giving a clean, OEM-plus finish that pairs naturally with either carbon-fiber rear diffuser. At NLP Performance, this is the configuration we point 991.2 Carrera owners toward first — it is the single change that most transforms how the car sounds and how it carries weight at the rear axle.

Carbon-fiber rear diffusers: the complementary aero

Akrapovic does not stop at the exhaust. For the 991.2 Carrera the company offers a hand-crafted, high-grade carbon-fiber rear diffuser in two finishes — high gloss and matte — both designed to frame the new tailpipes and tidy up airflow exiting beneath the rear valance. These are the complementary pieces to the hero Slip-On Line: they sharpen the rear-end aesthetic, add a genuine motorsport-grade carbon texture, and shave weight at the rearmost point of the car.

The choice between the two is purely visual. The high-gloss diffuser delivers a deep, lacquered carbon weave that catches light and reads as a clear performance statement. The matte diffuser offers a more understated, stealth finish that blends with darker paint and brushed trim. Both are engineered for the same C2 and C4 Carrera variants and complement the twin centrally located tailpipes of the Slip-On Line.

Weight savings & materials

Weight is where titanium earns its keep. Akrapovic Slip-On Line systems are designed to deliver a substantial reduction over the corresponding factory rear muffler, with the brand citing weight savings of roughly a third versus stock across its titanium slip-on range. On the 991.2 platform, that mass comes off the very back of the car — behind the rear axle — where shedding kilograms has an outsized effect on how the 911 rotates and settles.

The material story carries through to the diffusers. Both rear diffusers are made from genuine carbon fiber rather than carbon-look plastic, so they add stiffness and visual depth while contributing to that rear-weight reduction. The combination of a titanium muffler and carbon-fiber aero is exactly the recipe Akrapovic uses on its highest-end builds, scaled to a slip-on package that respects the OE catalytic system.

Sound & performance: what to expect

The Slip-On Line is finely tuned to give the turbocharged boxer engine a deeper, richer and more aggressive character without crossing into drone or discomfort on the highway. Where the factory 991.2 exhaust can sound muted under boost, the Akrapovic system lets more of the flat-six’s mechanical voice through — sharper on throttle, with a fuller mid-range and a cleaner overrun.

On the performance side, a slip-on is first and foremost an acoustic and weight upgrade rather than a big power play. Akrapovic engineers these systems to free up flow at the rear of the exhaust, which can yield modest gains in power and torque, but we encourage owners to view the Slip-On Line as the foundation of a build — the step that unlocks the sound and lightens the tail — with the optional stainless link pipe set available for those chasing additional flow. We do not publish unverified dyno figures; the headline benefits here are voice, weight and finish.

Fitment: exact years, engine code, and variants

This Akrapovic Slip-On Line is engineered for the 2016–2017 Porsche 911 Carrera in S, 4, 4S and GTS guise — all 991.2-generation cars running the 3.0L twin-turbocharged flat-six. That covers both rear-wheel-drive (C2) and all-wheel-drive (C4) variants, including Carrera S and the higher-output Carrera GTS. The two carbon-fiber rear diffusers share that 991.2 Carrera fitment, designed for the same C2 and C4 cars.

Note that this package is for the standard 991.2 Carrera family, not the 991.2 Turbo / Turbo S or the GT3, which use their own dedicated Akrapovic systems. If you are unsure which 911 you own, the engine displacement and badge are the quickest tell — the Carrera cars covered here carry the 3.0L turbo flat-six. At NLP Performance, our team can confirm fitment against your exact VIN before you order.

Installation & what’s required

Because it is a true slip-on, this system replaces only the rear muffler section and reuses the factory mounting points, so a skilled technician can typically complete the swap in a couple of hours. The titanium tips are included in this configuration, so no separate tip kit is required to finish the look. The factory catalytic converters and mid-pipe stay in place, which keeps the install clean and the emissions hardware intact.

The carbon-fiber rear diffusers install at the rear valance and are sold separately from the exhaust, letting you choose the high-gloss or matte finish that suits your car. If you want to add the optional stainless-steel link pipe set for extra flow, plan for it at the same time as the exhaust install. We recommend professional fitment to ensure the tailpipes sit correctly and the diffuser lines up cleanly with the new tips.

Product spotlight: build the complete package

Below are the three Akrapovic components we stock for the 991.2 Carrera S/4/4S/GTS. The Slip-On Line is the hero; the two diffusers are the complementary aero-and-cosmetic finishing pieces. Choose the gloss or matte diffuser to match your car’s paint and trim.