Next Level Performance
July 15, 2026 • 11 min read
The HKS GT2 supercharger is a bolt-on, intercooled centrifugal forced-induction system built specifically for the 2022–2024 Toyota GR86 (ZN8) and Subaru BRZ (ZD8) and their 2.4L FA24 boxer engine. It is the most complete factory-style power adder you can buy for the second-generation twins, taking the naturally aspirated FA24 from 228 hp to roughly 300 whp without opening the shortblock. In this review we break down exactly what the HKS GT2 S/C System delivers on the FA24, what is in the box, how long it takes to install, and the supporting mods our Tampa shop recommends to run it hard and keep it alive.
Our Verdict
The HKS GT2 S/C System is the definitive supercharger kit for the 2022+ GR86 and BRZ — roughly 300 whp, factory-quality engineering, and a linear, boxer-friendly powerband.
If you want the FA24's flat mid-range torque hole solved for good, the intercooled HKS GT2 kit is the halo choice. It is a $6,800 investment that needs a proper tune and a supporting clutch, but nothing else transforms these cars this cleanly.
Shop Our Top Pick →What Is the HKS GT2 Supercharger for the GR86 and BRZ?
The HKS GT2 supercharger is a centrifugal blower kit that mounts a belt-driven HKS GT2-7040L compressor to the front of the FA24 engine, feeding boost through an air-to-air intercooler and into the intake. Unlike a positive-displacement roots or twin-screw blower, a centrifugal supercharger builds boost with engine RPM, so power comes on progressively and the FA24 keeps its rev-happy, naturally aspirated character while gaining a huge mid-range and top-end punch.
HKS engineered this as a complete, direct-fit system for the second-generation GR86 (ZN8) and BRZ (ZD8). The GT2-7040L head unit is a step up from the FA20 GT2 blower used on the first-gen 86/BRZ — it uses a larger rotor to match the FA24's 2,387 cc displacement and higher stock airflow. Everything bolts to factory mounting points, retains the OEM catalytic converter location, and is designed to run on the stock FA24 internals at the kit's standard boost level.
For context, the stock 2022–2024 GR86 and BRZ make 228 hp at 7,000 rpm and 184 lb-ft at 3,700 rpm, with a factory 0–60 mph time of about 6.1 seconds in the six-speed manual. The chassis has always been brilliant; the FA24 has always been the weak link. The HKS GT2 kit is the most direct answer to that complaint.
A high-flow intake is one of the first supporting mods for a supercharged FA24.
How Much Power Does the HKS GT2 Add to the FA24?
HKS rates the GT2-equipped FA24 at 219 kW (297 PS, roughly 293 hp) at 6,100 rpm with its F-CON iS engine management — a gain of 56 PS over the stock crank figure — and peak torque climbing to 351 N·m (259 lb-ft) at 4,500 rpm. On a chassis dyno, tuned GT2 cars commonly put down 280–300 wheel horsepower, versus roughly 190–200 whp for a stock FA24. That is an 80–100 whp gain at the wheels, and just as importantly, it fills in the notorious 3,500–4,500 rpm torque dip that plagues the naturally aspirated boxer.
At the standard pulley ratio the GT2 runs in the neighborhood of 7–9 psi of boost, intercooled to keep intake temperatures — and therefore knock — under control. Because the compressor is engine-speed dependent, the power delivery is smooth and predictable: no turbo spool, no wastegate flutter, just a linear pull that keeps building all the way to the 7,000+ rpm redline. For a lightweight, rear-drive chassis like the GR86 and BRZ, that linearity is exactly what makes the car easier to drive fast, not harder.
HKS GT2 S/C System — Key Specifications
What's in the Kit and How Hard Is the Install?
The HKS GT2 S/C System Complete Kit is a genuinely complete package. In the box you get the GT2-7040L supercharger head unit, the drive and bracketry, all charge and intake piping, and a front-mount air-to-air intercooler measuring 383 x 178 x 100 mm, plus the required traction (supercharger) fluid and hardware. It is designed to bolt to the FA24 using factory-style mounting, which is why it is the tidiest forced-induction install available for these cars.
Plan on professional installation. HKS quotes roughly 8.5 hours of labor, and the kit is designed to be run with the HKS F-CON iS engine management (or an equivalent professional calibration) to control fueling and ignition for the added boost. HKS also recommends adding an engine oil cooler and a higher-temperature-rated oil, since sustained boost puts more heat into the FA24. Budget for a proper dyno tune — this is the single most important line item after the kit itself, because a supercharger is only as safe and as strong as its calibration.
One important note for buyers: the HKS GT2 kit is not CARB approved, so it cannot be shipped to or registered in California. Everywhere else, it is a race/off-road-classified system that installs cleanly for street and track use. At our Tampa, FL shop we treat the GT2 as a full-day job and always pair it with fresh plugs, an oil-and-filter service, and a post-install dyno session.
For higher-boost or built-motor GT2 builds, HKS offers FA24 head gaskets that drop compression to 11.3:1.
The GT2 is the cleanest way we install big power on a GR86 or BRZ. The car still idles and drives like stock, but the mid-range that the FA24 is missing from the factory is finally there. Every one we build gets a Stage 2 clutch and a real dyno tune before it leaves the bay.
— NLP Performance Install Team | Tampa, FL | ★★★★★
Supporting Mods for a Supercharged GR86 / BRZ
Adding 80–100 whp to a chassis engineered around 228 hp means a few supporting upgrades move from optional to essential. The stock clutch is the first weak point — it will slip under boost — so an upgraded clutch is mandatory. From there, a freer-flowing exhaust wakes up the supercharged top end, upgraded cooling protects against heat soak, and better suspension and brakes let you actually use the new power. Here is the supporting-mods package we build around the HKS GT2 on the 2022+ FA24 twins, all confirmed to fit and in stock at NLP Performance.
| Product | Role | Key Detail | Price |
|---|---|---|---|
| HKS GT2 S/C SystemTop Pick | Supercharger | ~300 whp, intercooled, 7–9 psi | $6,800.00 |
| Action Clutch Stage 2 (1SC) | Clutch | FA24D, holds boosted torque | $454.26 |
| HKS Hi-Power SPEC-L2 | Cat-back exhaust | SUS304, 10.0 kg, ~88 dB | $1,840.00 |
| Ohlins Road & Track | Coilovers | DFV monotube, height + damping adj. | $2,700.00 |
| Alcon 4-Piston Front BBK | Big brake kit | 332 x 32 mm 2-piece rotors | $3,605.49 |
| aFe Takeda Pro Dry S | Cold air intake | Sealed airbox, non-oiled filter | $387.00 |
The HKS Hi-Power SPEC-L2 is the natural exhaust pairing for the GT2, because it is engineered by the same brand for the same platform. It is a full SUS304 stainless cat-back with 65–50.8 mm piping and 94 mm dual tips, weighing just 10.0 kg — about 40% lighter than the OEM system — while keeping a JASMA-legal near-exhaust sound level around 88 dB. It frees up the supercharged top end without turning the car into a drone box on the highway.
Cooling upgrades like the CSF aluminum filler neck and high-pressure cap help a boosted FA24 fight heat soak.
A vented carbon fiber hood sheds weight and helps release underhood heat on a supercharged build.
HKS GT2 Supercharger vs Turbo vs Nitrous: Which Power Path?
Buyers cross-shopping the HKS GT2 usually ask whether a turbo kit or nitrous would be a better value. Each path has a clear personality. A centrifugal supercharger like the GT2 delivers the most factory-like drivability: instant throttle response, a linear boost curve tied to RPM, and no lag, which suits the GR86 and BRZ chassis perfectly. It is the choice if you want a car that behaves exactly like a more powerful version of stock.
A turbo kit can make more peak power for the money at higher boost, but it adds complexity, heat, and some lag, and the FA24 power delivery changes character. Nitrous is the cheapest per horsepower and adds a big hit on demand, but it is a supplemental system with a finite bottle, not a permanent power increase, and it demands disciplined tuning to stay safe. For a street-and-track GR86 or BRZ that you drive year-round, the intercooled HKS GT2 supercharger is the most usable, most reliable, and most resale-friendly of the three — which is exactly why it is our top recommendation.
What We Like
- + Roughly 300 whp with a linear, lag-free powerband
- + Complete kit with intercooler, piping, and hardware
- + Designed to run on stock FA24 internals at standard boost
- + Factory-quality HKS engineering and fitment
Things to Consider
- – $6,800 kit plus tune, clutch, and labor
- – Requires a professional dyno tune and ~8.5 hr install
- – Not CARB approved — cannot ship to California
Frequently Asked Questions
How much horsepower does the HKS GT2 supercharger add to the GR86 and BRZ?
The HKS GT2 supercharger takes the FA24 to about 297 PS (roughly 293 hp) at the crank with HKS F-CON iS management, and tuned cars typically put down 280–300 wheel horsepower. That is an 80–100 whp gain over a stock GR86 or BRZ, which puts down around 190–200 whp from the factory 228 hp rating.
Is the HKS GT2 supercharger reliable on a stock FA24 engine?
Yes — the HKS GT2 kit is engineered to run on stock FA24 internals at its standard 7–9 psi boost level, provided it is professionally tuned. HKS recommends adding an engine oil cooler and higher-temperature oil, and an upgraded clutch is required because the factory clutch will slip under the added torque. Regular maintenance and a conservative tune are the keys to longevity.
Does the HKS GT2 supercharger require a tune?
A tune is mandatory. The GT2 kit is designed to be run with HKS F-CON iS engine management or an equivalent professional calibration to control fueling and ignition for the added boost. Installing the hardware without a proper dyno tune risks a lean condition and engine damage, so budget for tuning as part of the project.
How long does it take to install the HKS GT2 supercharger?
HKS quotes approximately 8.5 hours of professional labor to install the GT2 S/C System. Because the kit includes the supercharger, intercooler, and all piping and hardware for a direct fit, an experienced shop can complete it in one day, followed by a dyno tuning session before the car returns to the road.
Will the HKS GT2 supercharger fit both the Toyota GR86 and Subaru BRZ?
Yes. The HKS GT2 S/C System Complete Kit (part hks12001-BT001) is a direct fit for both the 2022–2024 Toyota GR86 (ZN8) and Subaru BRZ (ZD8), since both share the same 2.4L FA24 engine and chassis. The kit uses factory-style mounting points on either car.
Is the HKS GT2 supercharger street legal?
The HKS GT2 kit is not CARB approved, so it cannot be shipped to or registered in California. In states without CARB emissions requirements it is sold as a race/off-road system that installs cleanly for street and track use. Always confirm your local emissions rules before purchasing.
Ready to Supercharge Your GR86 or BRZ?
Shop the HKS GT2 S/C System and every supporting mod for your FA24 build at NLP Performance.
Shop SuperchargersExpert install & tuning • Located in Tampa, FL
