Best 991.2 Porsche 911 Turbo/Turbo S Performance Mods

The 991.2 Porsche 911 Turbo/Turbo S (2017–2019) is one of the fastest bolt-on platforms ever built — a 3.8L twin-turbo flat-six making 540 hp in the Turbo and 580 hp in the Turbo S straight from Stuttgart. Yet its factory turbos, restrictive muffler, and conservative ECU tune leave a huge margin on the table. This roundup covers the six best 991.2 Porsche 911 Turbo performance upgrades we sell and install at NLP Performance in Tampa, FL — a titanium exhaust, a matched carbon diffuser, larger intercoolers, a plug-in tune worth roughly 70 wheel horsepower, and two suspension paths — with real specs, fitment years, and pricing so you can build in the right order.

Why Upgrade a 991.2 Porsche 911 Turbo/Turbo S?

The 991.2 Porsche 911 Turbo is a twin-turbocharged, all-wheel-drive supercar that responds better to bolt-ons than almost any other factory car. In stock form the 991.2 Turbo makes 540 hp and 486 lb-ft, while the Turbo S makes 580 hp and 553 lb-ft (590 lb-ft on overboost) and runs 0–60 mph in 2.6–2.8 seconds on its way to a 205 mph top speed. Both share a 3.8L direct-injected flat-six, a 7-speed PDK dual-clutch gearbox, and Porsche Traction Management AWD.

The reason these cars love modifications is the hardware Porsche left in place. The 991.2 uses larger turbochargers than the earlier 991.1, so the factory ECU tune is the primary restriction — not the turbos. That is why a simple reflash returns close to 70 wheel horsepower, and why a freer-flowing titanium exhaust and larger intercoolers translate directly into faster spool and more sustained power. In our Tampa shop, the 991.2 Turbo/Turbo S is the platform where owners see the biggest gains for the least money and zero reliability compromise.

Heat management is the other half of the equation. A tuned flat-six making 600+ wheel horsepower pushes far more air through the intercoolers, and in a hot climate like Tampa the factory cores heat-soak on repeated pulls, forcing the ECU to pull timing and power. That is why we treat larger intercoolers and a titanium exhaust as the foundation of any 991.2 Turbo build — they keep intake and exhaust temperatures in check so the engine can safely make and hold the power a tune unlocks. Every part below is a genuine bolt-on that reuses factory mounting points, so nothing here requires cutting, welding, or permanent modification to your Porsche.

The 6 Best 991.2 Porsche 911 Turbo Performance Upgrades

Below are the six upgrades we recommend most for the 2017–2019 911 Turbo and Turbo S, ordered from the highest-impact power and sound modifications down to bolt-in suspension. Each part is in stock at NLP Performance and verified to fit the 991.2 chassis.

1. Akrapovic Slip-On Line (Titanium) — Best Exhaust

The Akrapovic Slip-On Line is the best-sounding, lightest exhaust upgrade for the 991.2 911 Turbo. Machined entirely from lightweight titanium, it weighs 7.3 kg (43.7%) less than the factory muffler and is ECE type-approved, so it bolts on with no ECU remap required. It delivers a rich, deep tone at cruise that builds to a full titanium roar under boost without cabin drone. Note that it is a muffler assembly that requires the matching Akrapovic tips and rear diffuser to complete the installation.

2. Akrapovic Rear Carbon Fiber Diffuser — Completes the Exhaust

The Akrapovic Rear Carbon Fiber Diffuser is the high-gloss carbon panel that houses the Slip-On’s titanium tailpipes and finishes the rear of the 991.2 Turbo. It is a direct-fit replacement for the factory diffuser, made from genuine prepreg carbon fiber with a high-gloss weave, and is required to run the Slip-On Line tips correctly. Beyond function, it sharpens the car’s rear-end styling to match the exhaust upgrade.

3. AWE Tuning Performance Intercooler Kit — Best Cooling Upgrade

The AWE Tuning Performance Intercooler Kit is the essential supporting mod for any tuned 991.2 Turbo. Its larger-volume cores drop intake air temperatures dramatically over the factory units, which protects power on repeated pulls and hot Florida days and lets a COBB tune hold its timing. The kit is a direct bolt-in that reuses factory mounting and fits 2014–2018 911 Turbo and Turbo S models, so it works whether you run stock boost or a full Stage 2 setup.

4. COBB Accessport V3 — Best Value Power Upgrade

The COBB Accessport V3 is the highest power-per-dollar upgrade for the 991.2 911 Turbo. This handheld tuner flashes COBB’s off-the-shelf maps to the ECU and, on a Stage 1 tune, takes a 991.2 Turbo S from roughly 524 whp / 543 wtq to 594 whp / 639 wtq — a gain of about 70 wheel horsepower and 96 lb-ft. Expect around 15% gains on 91 octane and up to 18% on 93 octane. It doubles as a full-color gauge display and can read and clear diagnostic codes, and because it reflashes back to stock in minutes, it is the tune most owners trust for warranty visits.

5. KW H.A.S. Height-Adjustable Spring Kit — Best Adjustable Suspension

The KW H.A.S. (Height Adjustable Spring) kit is the best way to lower a 991.2 Turbo while keeping the factory ride quality and nose-lift system. Rather than replacing the struts, it installs KW’s adjustable spring perches onto the OE dampers, giving 15–35 mm (roughly 0.6–1.4 in) of continuously adjustable drop. It is engineered specifically for 2017–2019 Turbo/Turbo S models equipped with the OE front-axle lift system and fits coupes and convertibles, so you keep clearance for driveways and speed bumps while eliminating factory fender gap.

6. Eibach Pro-Kit Lowering Springs — Best Budget Stance

The Eibach Pro-Kit is the best budget path to a lower, tighter 991 Turbo. These progressive-rate springs lower the car 0.8 in in front and 0.4 in in the rear on 2014–2017 Turbo/Turbo S models, retaining the factory dampers and PASM adaptive shocks for a plug-and-play install. At $395 they deliver most of the visual and handling benefit of a lowering setup for a fraction of the cost of coilovers, backed by Eibach’s million-mile warranty.

991.2 Porsche 911 Turbo Upgrades Compared

Here is how the six upgrades compare at a glance — category, the headline benefit, verified fitment years, and current NLP Performance pricing. Every part links directly to its product page.

How to Stage Your 991.2 Turbo Build

Build your 991.2 911 Turbo in this order for the best results: exhaust and tune first, then supporting mods, then suspension. Start with the Akrapovic Slip-On Line and its carbon diffuser to unlock sound and shed weight with zero downside. Next, flash a COBB Accessport for the biggest single power jump — roughly 70 wheel horsepower on a Turbo S. Once you are tuned, add the AWE intercoolers so intake temperatures stay low and the ECU never pulls timing on back-to-back pulls. Finally, dial in the chassis: choose the adjustable KW H.A.S. kit if you want to fine-tune ride height and keep the OE nose lift, or the Eibach Pro-Kit if you want a proven fixed drop on a budget. Every part in this guide ships from our Tampa, FL warehouse and is backed by our fitment support team.