Honda F20C 45 mm EFI Shaftless ITBs – Direct‑to‑Head Throttle Bodies for S2000
Transform your S2000’s naturally-aspirated F20C engine with AT Power’s Direct-To-Head (DTH) 45 mm Electronic Fuel Injection Individual Throttle Bodies (ITBs). These port-matched, billet-crafted ITBs bolt directly onto the cylinder head, enhancing high-RPM airflow and throttle control.
Compatible Engines:
- Honda F20C (S2000 AP1/AP2)
- S2000 (no modifications required)
While similar engine may share architecture, port shape and spacing can vary. Check the technical drawings match your inlet ports.
Key Features & Benefits:
- Precision Fitment: Ideal for stock and power-built F20C engines; retains OEM fuel injectors and rails for optimal airflow and ease of installation.
- Shaftless Technology: Patented Shaftless butterfly valve design improves air velocity by 10% and throttle response by eliminating the central throttle shaft obstruction.
- Twin Oval Billet Housings: CNC-machined from high-grade billet aluminium for superior strength, durability, and reduced weight.
- Fully Assembled, Ready to Install: Delivered pre-assembled for direct bolt-on installation to the cylinder head intake face.
- EFI Ready with injector Blank-Offs: Allows fleixibly for custom fuel delivery setups. Fuel rails and injectots sold seperately.
- 45mm Bore Dimeter: Designed to maximise naturally aspirated performance for F20C engines.
Performance Advantages:
- Increased horsepower and torque
- Lightweight and durable
- Sharper throttle response and increased engine performance
- Perfect for naturally aspirated and tuned applications
- Ideal for motorsport applications, track day builds, race cars or high-performance engine builds and street setups
If you require something more bespoke, please contact us.
Engine Relocation
For fitment into standard (OEM) vehicles, it may be necessary to relocate the power steering pump or alternator & replace the existing water pump with an aftermarket electric water pump to allow package clearance for the installation of these Throttle Bodies. These ancillary products are directly available through:
TEGIWA IMPORTS Ltd (UK) Press here for TEGIWA IMPORTS website.
Complete the setup:
Important:
- ECU Compatibility and Tuning Required: Proper engine management system tuning is necessary for optimal operation and fuelling.
- Maps are supplied “as-is”. Professional dyno tuning is strongly recommended to ensure optimal performance and avoid potential engine damage.
If you require something more bespoke, please contact us.
Motorsport Use Only! This product is designed for professional motorsport applications and must be installed by a qualified technician. If assistance is required, please contact AT Power’s sales team.

















