K&N AIR FILTER TB-9004

Performance Upgrade for Carbureted & EFI Air-Cooled Triumph Modern Classics (2001–2016)

Upgrade your stock air filter with the K&N High-Flow Air Filter, engineered specifically for classic Triumph twins. Designed to fit directly in place of the OEM filter, this unit provides enhanced airflow and long-lasting filtration without the need for ECU remapping — making it a practical performance upgrade for both carbureted and early EFI models.

Ideal for riders looking to improve throttle response and airflow, especially when combined with performance exhaust systems or airbox mods.

Key Technical Features:

Increased Horsepower & Torque
Designed to reduce intake restriction, helping your engine breathe more freely for a noticeable gain in responsiveness and midrange pull.

Large Surface Area with Pleated Cotton Gauze
The multi-layered cotton construction offers superior airflow while maintaining excellent filtration — and ensures longer service intervals between cleaning.

Washable & Reusable
Pre-oiled and ready to install out of the box. This filter can be cleaned and re-used repeatedly, reducing long-term maintenance costs.

Application-Specific Fit
Custom-designed sealing bead and base plate ensure a tight, reliable seal within the factory airbox — no modifications needed.

Built to Last
Manufactured in the USA for over 40 years, backed by K&N’s No-Hassle Limited Lifetime Warranty.

Fitment – Triumph Modern Classics (Air-Cooled Twins):

✔ Bonneville 800 (2001–2006)
✔ Bonneville 865 (2005–2015)
✔ Bonneville SE 865 (2009–2013)
✔ Scrambler 865 (2006–2016)
✔ Thruxton 900 (2004–2016)

⚠️ Note for Tuners: While ECU tuning isn’t required for basic installation, combining this filter with free-flow exhaust or airbox removal may require a remap or jetting adjustments for optimal performance.

Why Choose K&N?

• Proven performance gains for classic Triumph models

• Washable and reusable for lower lifetime cost

• No ECU remap required for stock or lightly modified setups

• Trusted by riders and custom builders worldwide

Whether you’re maintaining your Bonneville for daily use or upgrading a Scrambler project, the K&N High-Flow Air Filter is a tried-and-tested component that boosts breathing and keeps your engine protected.