Akrapovic Titanium Exhaust: 991.2 911 Turbo Review

The Akrapovic Slip-On Line (Titanium) for the 991.2 Porsche 911 Turbo and Turbo S is a hand-built titanium exhaust that strips 16.1 lb (7.3 kg) from the factory system while unlocking the deep, metallic Akrapovic soundtrack the stock car keeps muffled. It is the single most popular first mod for the 2016–2017 991.2 Turbo, and at NLP Performance it is a genuine bolt-on: no tune required, no cutting, and full compatibility with the car's factory 3.8L twin-turbo flat-six. This review breaks down exactly what it does, what it costs, what else you need to finish the install, and whether it is worth $6,685.26 on an already-brutal 540–580 hp car.

What Is the Akrapovic Slip-On Line for the 991.2 Turbo?

The Akrapovic Slip-On Line (Titanium) is a rear-section performance exhaust designed specifically for the 2016–2017 Porsche 911 Turbo and Turbo S (991.2 generation). A slip-on replaces the factory rear mufflers and connecting pipework — it "slips on" downstream of the catalytic converters — so it is emissions-friendly, reversible, and does not disturb the factory turbochargers or cats. Akrapovic markets it as the first stage of its exhaust tuning program, and its two headline benefits are dramatic weight reduction and the unmistakable Akrapovic sound.

Carrying part number S-PO/TI/6H, this system is built from aerospace-grade titanium alloy and is ECE type-approved. In our Tampa shop, it is the mod 991.2 Turbo owners ask about first, and for good reason: the factory Porsche exhaust is heavy and deliberately restrained, so a titanium slip-on delivers an outsized change in both the way the car feels over the rear axle and the way it sounds under boost.

How Much Weight Does It Save on the 991.2 Turbo?

The Akrapovic Slip-On Line drops the 991.2 Turbo's rear exhaust weight from 16.7 kg to 9.4 kg — a reduction of 7.3 kg, or 16.1 lb, which is 43.7% lighter than stock. That is the number that matters most on this car. The 911's engine sits behind the rear axle, so removing 16 lb of steel from the tail of the chassis measurably reduces polar moment and helps the rear settle faster on corner exit. It is real, unsprung-adjacent weight taken from the worst possible place for handling.

Titanium is why those numbers are possible. It is roughly 40% lighter than the stainless steel Porsche uses from the factory, yet it tolerates the extreme exhaust-gas temperatures a 540–580 hp twin-turbo flat-six produces. Akrapovic hand-welds the system and finishes the visible sections with the blue-tinted heat signature titanium is known for once it has been through a few heat cycles.

Sound, Power and Driving Feel: What to Actually Expect

The Slip-On Line's biggest transformation is aural, not dyno-chart. On the 991.2 Turbo it wakes up a flat-six that Porsche intentionally quieted for refinement, adding a harder, metallic edge at wide-open throttle and a more present burble on overrun — without the drone that plagues cheaper cat-back systems on the highway. It is loud enough to reward you and civil enough to daily. Akrapovic tunes the internal volume so the sound builds with boost rather than booming at idle.

On power, set expectations correctly: Akrapovic states the system delivers gains in power and torque across the rpm range, but on a 540 hp Turbo (580 hp in the Turbo S) that is already choked by factory emissions plumbing ahead of the slip-on, the realistic gain is modest — typically a handful of horsepower and a slightly crisper throttle response, not a double-digit jump. The honest value here is 16.1 lb of weight loss plus the sound and the jewelry-grade titanium build. Buyers chasing big power numbers should pair the exhaust with an intercooler and an ECU tune, which we cover below.

What Else You Need: Tips and the Carbon Diffuser

The Slip-On Line is sold as the mufflers only and requires the matching titanium tailpipe tips and Akrapovic carbon fiber rear diffuser to complete the installation and the look. On the 991.2 Turbo, the diffuser is not merely cosmetic — it houses and frames the twin center-exit tailpipes, so it is the piece that turns the slip-on into a finished factory-grade rear end. NLP Performance stocks the exact-fit high-gloss carbon diffuser for the 991.2 Turbo/Turbo S at $3,940.27.

991.2 Turbo vs Turbo S: Which One Do You Have?

Both the 991.2 Turbo and Turbo S share the same 3.8L twin-turbo flat-six, 7-speed PDK, and all-wheel drive, and the Akrapovic Slip-On Line (S-PO/TI/6H) fits both. The difference is output. The 991.2 Turbo makes 540 hp and 523 lb-ft of torque (in overboost), hits 60 mph in 2.9 seconds, and tops out at 199 mph. The Turbo S steps up to 580 hp and 516 lb-ft (553 lb-ft in overboost), runs 0–60 in a supercar-humbling 2.8 seconds, and reaches 205 mph.

Because both cars route their exhaust through the same rear-section architecture, the titanium slip-on delivers the identical 16.1 lb weight savings and the same sonic upgrade on either model. If you are shopping and unsure which you own, the Turbo S adds standard center-lock wheels, PDCC active anti-roll, ceramic brakes, and the higher-output engine from the factory.

Completing Your 991.2 Turbo Build: The Upgrade Lineup

The Slip-On Line is stage one. If your goal is a comprehensive 991.2 Turbo build — more power, better cooling, and a sharper stance — the table below shows how the exhaust fits alongside the other in-stock upgrades we recommend for this platform. An intercooler upgrade is the single best supporting mod for real, repeatable power on a boosted flat-six, while a set of lowering springs closes the factory wheel gap that dampens the 911's look.

Best Supporting Mod for Power: AWE Intercooler Kit

If the exhaust is stage one for weight and sound, the AWE Tuning Performance Intercooler Kit is stage one for actual power. Larger-capacity cores keep intake temperatures down during hard, repeated pulls, so a tuned 991.2 Turbo holds its boost and its numbers instead of pulling timing when the factory intercoolers heat-soak. It is the natural pairing with a tune when you are ready to chase real gains.

Dial In the Stance: KW H.A.S. Lowering

The KW Height Adjustable Spring (H.A.S.) system lets you lower the 991.2 Turbo up to roughly an inch while retaining the factory PASM dampers and, critically, the front-axle nose-lift on lift-equipped cars — a must in Tampa's driveway-and-speed-bump reality. At $1,864.00 it is the sweet spot between a basic spring kit and a full coilover, and it closes the wheel gap that keeps a stock Turbo looking taller than it should.

Installation: Is the Slip-On a DIY Job?

The Akrapovic Slip-On Line is a bolt-on that a competent shop installs in roughly two to three hours. Because it mounts downstream of the catalytic converters, there is no welding, no cutting, and no tune required — the factory O2 sensors and emissions equipment stay untouched, which keeps the car street-legal and reversible. In our Tampa shop we torque the clamps to spec, verify the titanium tips sit centered in the carbon diffuser, and heat-cycle the system so the titanium develops its signature blued finish. Owners who are comfortable under a lifted car can do it at home, but the tailpipe-to-diffuser alignment is where professional installation earns its keep.