K&N Replacement Air Filter for BMW 318i/325i/330i/M3 1999-2006, Washable Cotton Gauze Panel

K&N 33-2231 High-Flow Air Filter

Enhance your BMW's performance with the K&N 33-2231 High-Flow Air Filter. Designed specifically for a range of BMW models from 1999 to 2006, this filter uses a state-of-the-art layered, oiled cotton media that not only improves airflow but also efficiently captures contaminants. This means you're not just getting better airflow; you're also protecting your engine, which translates into an increase in horsepower.

Why Choose K&N?

Every K&N air filter is engineered to be reusable, lasting for the entire lifespan of your vehicle. Plus, with K&N's No-Hassle Lifetime Limited Warranty, you can rest easy knowing you’re covered. The drop-in design means installation is a breeze—simply swap out your factory filter and start enjoying the benefits of superior airflow and performance.

Features

• Air Filter Material: Cotton Gauze
• Air Filter Shape: Panel
• Filter Re-Oiling Amount: 1 oz (30 ml)
• Frame Design: Flexible
• Height: 1.063 in (27 mm)
• Item Type: High Performance
• Oil Included: Yes
• Outside Length: 9.375 in (238 mm)
• Outside Width: 6.875 in (175 mm)
• Package Contents: 1 Air Filter
• Package Material: Paperboard
• Package Quantity: 1
• Package Type: Box
• Pre-Screened: No
• Product Style: Panel Air Filter
• Warranty: No-Hassle Lifetime Limited
• Washable: Yes
• Weight: 0.8 lb (0.3 kg)

Installation Instructions

• For detailed installation instructions, CLICK HERE.

Fitment

• BMW 325xi (2002-2005)
• BMW 325Ci (2006)
• BMW 320i (2005)
• BMW 325i (2003-2005)
• BMW 318ti (1999)
• BMW 330i (2005)
• BMW 330Ci (2002-2006)
• BMW 328Ci (2000)
• BMW 323i (1999-2000)
• BMW 330xi (2005)
• BMW M3 (2001-2006)
• BMW X3 (2005-2006)
• BMW 318i (1999)
• BMW 323Ci (2000)
• BMW 328i (2000)

Real-World Feedback

BMW 330i owners have reported noticeable improvements in throttle response and overall engine smoothness after installing the K&N 33-2231. One user mentioned, “After swapping out the stock filter for the K&N, my car feels more alive. The engine breathes better, especially at higher RPMs, and I can feel the power increase.”