HKS GT2 Supercharger Install: 2000-2009 Honda S2000

The HKS GT2 Supercharger is the gold-standard forced-induction upgrade for the Honda S2000, turning the naturally aspirated F20C and F22C into a 300-plus wheel-horsepower roadster without sacrificing the engine’s trademark 8,000–9,000 rpm ceiling. At NLP Performance in Tampa, FL, the GT2 kit is one of the most-requested S2000 builds we quote — and one of the most involved. This guide walks through exactly what the kit makes, the supporting mods you cannot skip, and a step-by-step overview of how the install goes on an AP1 or AP2 S2000.

What Is the HKS GT2 Supercharger?

The HKS GT2 Supercharger is an intercooled, belt-driven centrifugal supercharger system designed specifically for the 2000–2009 Honda S2000 (AP1 and AP2). It uses HKS’s redesigned 7040-series centrifugal blower — a lighter, more durable evolution of the original GT Supercharger — to spin boost that builds progressively with rpm, which is why it feels closer to a big naturally aspirated engine than to a laggy turbo. Unlike a positive-displacement roots or twin-screw blower, a centrifugal unit makes peak boost at peak rpm, a perfect match for the high-revving F-series.

The complete Pro kit ships with the GT2 supercharger unit, an air-to-air intercooler, all charge piping, a relief (bypass) valve, the drive pulley and belt, supercharger oil components, the suction pipe, and mounting hardware. A factory US-market AP1 makes 240 hp at 8,300 rpm from its 2.0L F20C, while the AP2’s 2.2L F22C makes 237 hp at 7,800 rpm — the GT2 roughly a third to a half more power on top of that, depending on pulley and fuel.

How Much Horsepower Does the HKS GT2 Supercharger Make?

Out of the box, the HKS GT2 Supercharger produces roughly 310 wheel horsepower and 213 lb-ft of torque at approximately 10 psi of boost on a healthy S2000. That is a jump from the ~190–207 whp a stock F20C/F22C typically puts down, and it arrives without gutting the car’s civility. Swap to a smaller supercharger pulley and boost climbs to about 12.5 psi, lifting output to roughly 324 whp and 221 lb-ft. With the right fuel system and tune, S2000 owners have reliably run 400-plus crank horsepower as a street-driven daily.

Supporting Mods You Need Before You Install

The HKS GT2 Supercharger is not a bolt-it-on-and-drive part — the F-series needs more fuel and a proper calibration to run boost safely. Below is the supporting-mods build sheet we quote alongside the blower. The fuel pump, injectors, and ECU tune are non-negotiable; the exhaust and oil cooler are strongly recommended for a car that will see track days or Tampa summer heat.

Fuel System: 750cc Injectors and a Boost-Ready Pump

At 10 psi the stock 310cc-class injectors and factory fuel pump run out of headroom, so the HKS 750cc fuel upgrade is the first box to tick. It pairs 750cc/min injectors with a higher-flow pump so the F-series holds a safe air-fuel ratio into the top of the rev range. If your car already has an adequate pump, the standalone injector kit covers the injector side alone.

Engine Management: Why a Standalone or Reflash Is Mandatory

HKS is explicit that ECU tuning is mandatory with the GT2 kit — there is no plug-and-play map that safely fuels a boosted F-series. A standalone unit like the Haltech Platinum Pro gives a tuner full control of fuel and ignition timing so the car can be dialed in for the exact boost, injectors, and fuel the build is running. Skipping the tune is the single fastest way to hurt an F20C or F22C.

How to Install the HKS GT2 Supercharger: Step by Step

The HKS GT2 Supercharger is a professional-level install that takes an experienced shop roughly 12–16 hours plus dyno time. Below is the high-level sequence we follow at NLP Performance. This is an overview, not a substitute for the HKS instruction manual — always torque to spec and follow the supplied documentation.

1. Baseline and prep. Put the car on the dyno for a baseline pull, then let it cool. Disconnect the battery, drain the coolant, and raise the car. A cold engine and a clean bay make everything faster.
2. Remove the factory intake and airbox. Strip the OEM intake tract and any brackets that conflict with the supercharger mount and charge piping.
3. Mount the GT2 supercharger and drive. Bolt the blower bracket to the block, install the crank drive pulley and belt, and set belt tension to spec. The centrifugal unit rides off the accessory drive.
4. Install the intercooler and charge piping. Mount the air-to-air intercooler up front, route the charge pipes and suction pipe, and fit the relief (bypass) valve. Double-check every clamp — a blown coupler under boost dumps power instantly.
5. Upgrade the fuel system. Install the 750cc injectors and the boost-ready fuel pump so the F-series can hold target air-fuel ratios once boost is live.
6. Wire the engine management. Install and wire the standalone ECU (Haltech) and a wideband O2 sensor. This is the backbone of a safe tune.
7. Fill supercharger oil and leak-check. Add the S/C oil per the kit, refill coolant, and pressure-test the charge system for leaks before the first start.
8. Dyno tune (mandatory). A professional tuner sets fuel and timing for ~10 psi. Confirm safe knock margin and AFR through the full 8,000–9,000 rpm sweep.
9. Heat-cycle and re-torque. Heat-cycle the belt, re-check clamp torque, and make a final verification pull. Then enjoy roughly 310 whp of boosted F-series.

Keep It Cool and Planted

A supercharged S2000 asks more of its cooling and chassis. A Mishimoto thermostatic oil cooler keeps oil temperatures in check during hard Florida driving, and a set of KW V3 coilovers turns the extra 100-plus horsepower into corner-exit speed instead of wheelspin. Neither is required to make power, but both transform how usable that power is on a back road or track day.

HKS GT2 Supercharger: Pros and Cons