Porsche 991.2 Turbo Akrapovic Exhaust Install Guide

Installing an Akrapovic Slip-On exhaust on a 2016-2017 Porsche 911 Turbo / Turbo S (991.2) is one of the highest-impact bolt-ons you can do to the twin-turbo flat-six — and it is a genuine driveway job. The factory 991.2 Turbo makes 540 hp (Turbo S: 580 hp), yet its heavy steel rear silencer muffles the character of the 3.8L engine. Akrapovic's titanium Slip-On Line drops in without cutting or welding, sheds meaningful weight, and finally lets the Turbo breathe and sound the way it should. This step-by-step guide covers the install, the tools and torque figures, the two kit configurations, and the tune and cooling upgrades that turn a slip-on into a complete package.

Why Upgrade the 991.2 Turbo Exhaust?

The 991.2 Turbo's factory exhaust is heavy and conservative by design. Porsche's 3.8L twin-turbo flat-six produces 540 hp and 486 lb-ft in the Turbo and 580 hp with up to 553 lb-ft (on overboost) in the Turbo S, launching the Turbo S to 60 mph in roughly 2.8 seconds. The catch: the OEM rear silencer is a large stainless assembly that adds weight over the rear axle and tames the engine note even with the sport valves open. A titanium slip-on attacks both problems at once — it removes mass exactly where you least want it and opens up the acoustic signature the turbochargers otherwise smother.

A slip-on is also the smartest first step because it is fully reversible. It replaces only the rearmost muffler section behind the catalytic converters, so it bolts to the factory hardware, keeps the OE emissions equipment in place, and can be swapped back to stock in an afternoon. That makes it ideal for a $150,000+ car you may sell or lease-return later.

Akrapovic Slip-On Line: What You Get

Akrapovic builds the 991.2 Turbo Slip-On Line from high-grade titanium, which is why it sheds roughly 8 kg (about 18 lb) versus the factory rear silencer. The system retains the car's factory sound-control valves, so you keep quiet, neighbor-friendly cold starts and a deeper, race-derived roar when you open it up. The complete package pairs the titanium muffler with Akrapovic's carbon-fiber tailpipe tips and a high-gloss carbon-fiber rear diffuser, giving the back of the car a finished, factory-plus look rather than an obviously aftermarket one.

How to Install the Akrapovic Slip-On on a 991.2 Turbo

At NLP Performance in Tampa, FL, the Akrapovic Slip-On is the exhaust we fit most often to 991.2 Turbos, and it is one we happily recommend tackling in your own garage. A 991.2 Turbo slip-on install takes most enthusiasts 2 to 3 hours and needs no cutting, welding, or special exhaust tools. The rear silencer is bolted and clamped to the factory system, so the job is a straight swap. Read the Akrapovic-supplied instructions first, and if the car has been driven, let the exhaust cool completely before you begin.

Tools You Will Need

• Floor jack and two jack stands (or a lift)
• Metric socket set and ratchet (10mm-15mm), plus an extension
• Torque wrench
• Penetrating oil for the factory clamp and mount hardware
• Anti-seize for the fasteners on reassembly
• New exhaust gaskets and clamps if yours are worn (reuse OE hardware where serviceable)

Step-by-Step

1. Raise and secure the car. Lift the rear on the factory jack points and support it on stands. Let the exhaust reach ambient temperature.
2. Disconnect the sound-valve actuator. Unplug the vacuum/electronic connection to the factory valve so you can transfer or reconnect it to the Akrapovic muffler per the instructions.
3. Loosen the clamps. Apply penetrating oil, then loosen the band clamps joining the rear silencer to the mid-pipes. Support the muffler as you free it.
4. Remove the factory rear silencer. Unbolt the rubber hangers and lower the OE unit out. It is heavy — have a second set of hands ready.
5. Fit the Akrapovic titanium muffler. Hang it loosely on the factory mounts, slide the inlets onto the mid-pipes, and start the clamps by hand so you can align everything.
6. Reconnect the sound valves. Attach the actuator to the Akrapovic valve so quiet/loud modes still track the drive-mode selector.
7. Align, then torque. Center the tips in the bumper cutouts, then tighten the clamps and hangers to spec (typical exhaust band clamps land near 15-20 lb-ft — always follow Akrapovic's supplied figures).
8. Install the carbon tips and diffuser. Fit the carbon-fiber tips and bolt on the high-gloss rear diffuser, confirming even gaps against the bumper.
9. Start and inspect. Start the engine, cycle Sport and Sport Plus to confirm valve operation, and check every joint for leaks before lowering the car.

Complete Kit vs Base Slip-On: Which Akrapovic Configuration?

The Slip-On Line comes two ways. The complete kit bundles the titanium muffler, carbon tips, and high-gloss carbon diffuser in one part number. The base Slip-On Line (Req. Tips/Diffuser) is the titanium muffler alone — the right pick if you plan to reuse factory tips, choose the matte diffuser, or spread the cost. Both weigh the same and install identically. Here is how the exhaust options and the two most popular follow-up mods compare:

Finishing the Look: Carbon Diffuser & Tips

If you buy the base slip-on, the high-gloss carbon-fiber rear diffuser is what ties the install together. It replaces the factory lower valance with prepreg carbon that frames the titanium tips and gives the rear a purposeful, motorsport-inspired stance. A matte version is also offered if you prefer a satin finish over the wet-look gloss. Either way, the diffuser is a bolt-on that shares mounting points with the OE panel, so no fabrication is required.

Complementary Mods: Tune and Cooling

A slip-on frees flow and adds sound, but the biggest power gains on a 991.2 Turbo come from tuning and better charge cooling. A Cobb AccessPORT V3 flashes the ECU (and PDK on Turbo/Turbo S) with off-the-shelf maps that typically unlock 60-90 additional wheel horsepower on pump gas — a dramatic jump for a handheld device. Pair it with an upgraded intercooler set to keep intake air temperatures in check during repeated hard runs, especially in Tampa's summer heat, and the platform stays consistent instead of pulling timing when it gets heat-soaked.