WRX Non-underdrive Crank Pulley

🔧 Product Description

The GFB 2009 Lightweight WRX Non-Underdrive Crank Pulley from Go Fast Bits is a precision-engineered performance upgrade designed to improve engine responsiveness by reducing rotational mass on the crankshaft.

Manufactured from anodised aircraft-grade billet 6061-T6 aluminium, this pulley replaces the factory crank pulley while retaining OEM belt sizing—meaning no underdrive effects and no additional modifications required.

⚙️ Key Features

• Part Number: 2009
• Non-underdrive design (maintains factory accessory speeds)
• CNC-machined 6061-T6 billet aluminium
• Hard anodised for durability and corrosion resistance
• Lightweight construction reduces rotational inertia
• Direct replacement – uses factory belts
• Application-tested for reliability and safety

🏁 Performance Benefits

• ⚡ Sharper throttle response
• 🚀 Improved acceleration and engine rev speed
• 🔄 Faster engine “spin-up” under load
• 🛠 Reduced rotational mass on crankshaft
• 🎯 More responsive and lively driving feel

By reducing inertia, the engine behaves more freely—similar in effect to a lightened flywheel, improving responsiveness without affecting accessory drive performance.

🔬 Engineering & Reliability

Unlike poorly designed lightweight pulleys that can introduce harmonic issues, the GFB design is:

• Thoroughly application tested
• Engineered to avoid harmful resonance
• Safe for long-term use on supported Subaru engines

👉 GFB specifically avoids engine platforms where lightweight pulleys may cause reliability concerns.

🚗 Vehicle Applications

This pulley suits a wide range of Subaru turbocharged models, including:

• Subaru WRX GC8 (MY97–00 / MY99–00)
• Subaru WRX Bugeye (MY01–02)
• Subaru WRX Hawkeye (MY06–07)
• Subaru WRX EJ255 (MY08–14)
• Subaru WRX STI (MY03–14 variants)
• Subaru Impreza 2.0 Turbo GT EJ series
• Subaru Forester XT (selected models)
• Subaru Legacy / Liberty GT (BM/BR, BE/BH platforms)

🔩 Specifications

• Product Type: Lightweight crank pulley
• Material: Billet 6061-T6 aluminium
• Finish: Hard anodised
• Design: Non-underdrive (OEM belt speed retained)
• Installation: Direct bolt-on replacement
• Brand: Go Fast Bits (GFB)
• Part Number: 2009

🛠️ Installation Notes

• Replaces factory crank pulley
• Uses original factory belts
• No ECU tuning required
• Straightforward bolt-on installation
• Recommended for performance upgrades and bolt-on builds

💡 Why Choose the GFB 2009 Pulley?

If you want:

• A simple bolt-on performance improvement
• Noticeably better throttle response without reliability risk
• OEM accessory operation with reduced rotating mass

👉 This is one of the easiest and safest “feelable” performance upgrades for Subaru turbo engines.

🏆 Perfect For

• Subaru WRX and STI owners
• Daily-driven performance builds
• Bolt-on tuning setups
• Drivers wanting better response without changing boost or tune

✅ Summary

The GFB 2009 Lightweight WRX Crank Pulley delivers a noticeable improvement in engine responsiveness and acceleration feel by reducing rotational inertia while maintaining OEM accessory operation. It’s a simple, reliable, and effective upgrade for Subaru enthusiasts seeking immediate driving improvement.