Cold Air Intake for BMW E46 323 325 328 330 (1998-2005) I6 Engine

Enhanced Induction Sound and Throttle Response for Your BMW E46 M54/M52TU Inline-Six

Who It’s For: Designed specifically for BMW 3-Series (E46) owners looking to extract more character and efficiency from the legendary M54/M52TU Inline-Six engine.

The Problem: The factory BMW E46 intake is designed primarily for sound suppression and comfort. The stock plastic airbox creates a restrictive path for airflow, and the internal paper filters are prone to clogging, which stifles the M54 engine’s ability to breathe at higher RPMs. If you’re looking for that signature BMW straight-six growl and better off-the-line response, the factory setup is holding you back.

The Solution: We engineered this Stage 2 Cold Air Intake system to replace the restrictive factory housing with high-flow T304 lightweight aluminum piping. By utilizing a dedicated heat shield and a washable high-flow filter, we correct the factory airflow limitations of the M54/M52TU, providing a more direct path for cool air to reach the throttle body while delivering a deep, aggressive induction note.

Why This is the Ultimate Upgrade

• Optimized Airflow: The T304 aluminum piping reduces air turbulence compared to the ribbed factory plastic hoses, resulting in a noticeable improvement in throttle response and a potential gain of up to 10% in horsepower and torque.
• Advanced Heat Management: This Stage 2 kit includes a custom-fit heat shield designed to isolate the air filter from the radiant heat of the engine bay, ensuring the M54 draws in the densest, coolest air possible.
• Lived-Experience Installation: Having swapped dozens of these on the E46 chassis, I can confirm this is a true bolt-on project. It utilizes factory mounting points and can be completed in under 60 minutes with basic hand tools—no cutting or permanent modification required.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 1998-2000 BMW 323i / 323Ci (E46)
• 1998-2000 BMW 328i / 328Ci (E46)
• 2001-2005 BMW 325i / 325Ci / 325xi (E46)
• 2001-2005 BMW 330i / 330Ci / 330xi (E46)

Interchange Part Numbers:

E46-INTK-ST2, M54-B25-B30-COLD-AIR, 323i, 325i, 328i, 330i, 323Ci, 325Ci, 328Ci, 330Ci, 325xi, 330xi

The Performance Promise

Buy with confidence. As specialists who have lived under the hoods of E46s for over a decade, we know exactly what these M54 engines need to perform. This kit delivers the sound and response your BMW should have had from the factory. Backed by real automotive expertise and fast shipping.