K&N BU-9003 High-Flow Round Air Filter for Buell XB/Lightning/Ulysses Motorcyles

Vehicle Fitment

• Buell Firebolt XB12R (2004-2010)
• Buell Lightning XB12S / XB12SCG / XB12SS / XB9R / XB9S / XB9SX series (2002-2010, depending on model)
• Buell Ulysses XB12X / XB12XT / XB12XP (2006-2010) and compatible models where BU-9003 is specified

Fitment Notes

• Drop-in filter - designed to replace the stock air filter element in compatible Buell motorcycles without modification
• Ensure your air-box matches the original OEM design before installation; use only on supported models/year ranges listed above

Features

• Washable, reusable cotton-gauze filter media for long service life
• High-flow design to reduce intake restriction and improve airflow compared to stock filters
• Pleated media provides a large filtration surface for efficient dust and contaminant capture while maintaining airflow
• Application-specific sealing bead for secure, airtight fit in OEM air-box
• Pre-oiled and ready to install - no extra prep needed out of the box
• Intended to improve engine breathing, throttle response, and overall airflow under load or spirited riding
• Durable construction suitable for repeated cleaning cycles and long-term use
• Reusable design reduces long-term maintenance cost compared with disposable filters

Specifications

• Filter Shape: Round (non-flanged)
• Outside Diameter (OD): 12.0 in
• Height: 3.875 in
• Filter Material: Cotton Gauze
• Washable / Reusable: Yes
• Re-oil Amount (after cleaning): 1.07 oz (≈ 32 ml)
• Included Components: 1 x Air Filter

Included Components

• 1 x K&N BU-9003 Round High-Flow Air Filter (pre-oiled)

Product Description

The K&N BU-9003 is a high-flow, washable and reusable replacement air filter engineered specifically for a range of Buell motorcycles - including the Firebolt, Lightning, and Ulysses families - where the OEM air-box accepts a round filter element. Its cotton-gauze, pleated media improves airflow compared to standard disposable filters, allowing the engine to breathe easier and respond more readily under load or during spirited riding. Because the filter is washable, re-oilable, and reusable, it provides long service life and reduces the need for frequent replacements.

Installation is straightforward on compatible models: simply remove the stock filter element and insert the BU-9003 into the factory air-box - no modifications required. Regular cleaning and re-oiling per manufacturer instructions will help maintain optimal airflow and filtration efficiency over the long term, making BU-9003 a practical and performance-oriented upgrade for Buell owners seeking reliability, durability, and improved engine performance.