Our Performance CSL Air Filters start with a multi-layer oiled cotton construction that contains millions of smaller fibers to provide superior filtration and performance over the OEM filter. Precisely manufactured for a secure fitment to ensure all the air entering your motor is properly filtered. With the CSL E46 only being offered in Europe, the OEM air filters are produced in much lower quantities making them harder to obtain and drive up the price. Turners solution is a price effective solution that offers premium filtration with increased flow, extended service interval and lifespan.

Having a clean air filter ensures your engine is running at its best efficiency! Proper air flow will help your engine breathe, get the best fuel economy and allow full power throughout the power band. Get the most out of your CSL intake with a new Oiled High Flow Air Filter. These filters can be cleaned, oiled and reused for an extended service life.

Oiled versus Dry Filters:

Although both options will keep the air to your engine clean and improve airflow, there are a few differences to consider when choosing the best filter for you. Oiled filters allow better airflow than dry filters, however they require more maintenance. Oiled filters will likely get dirty faster, needing to be cleaned more regularly. When cleaning an oiled filter, it is necessary to oil them with filter oil afterwards.
Dry filters offer slightly lower airflow but are easier to maintain while still out performing the OE paper filter. Dry filters can be washed with warm soapy water. There is no oiling necessary afterwards.
Both dry and oiled filters flow better than stock and can be reused.
Product Features:

Direct Replacement for OEM filter
Increased air flow
Lower cost
Serviceable
Readily available
How to service an oiled air filter:

Take out your High Flow Filter
Gently tap your air filter on a smooth surface
Wash with warm soapy water a a soft bristled brush
Rinse with low pressure water
Let the filter air dry
Apply new filter oil
Ready to reinstall for a fresh drive!

Universal High-Flow Air Filter

Give your engine the airflow it deserves with this reusable, high-performance air filter—perfect as a direct replacement for an ECS intake system or as the finishing touch for your custom intake project.
Dimensions: 4.5" Base OD • 6" Filter Height • 3.5" Top OD

Upgrade from your restrictive factory filter to an ECS Tuning High-Flow Dry Air Filter and let your engine breathe freely. Improved intake flow enhances power throughout the rev range while helping maintain efficient fuel economy.

Oiled vs. Dry Filters — Which Is Right for You?

Oiled Filters

Offer slightly higher airflow for maximum performance

Require more frequent cleaning

Must be re-oiled after each cleaning

Long-term reusable design saves money over disposable paper filters

Dry Filters

Provide excellent airflow with minimal maintenance

Easily cleaned with warm, soapy water—no oiling required

Still flow significantly better than OE paper filters

Fully reusable and cost-effective

Both versions deliver superior performance over stock filters while offering the long-term benefit of reusability. Choose the option that best fits your maintenance style and performance goals.

For optimal performance, consider the 46.5mm To 61.0mm Silicone Coupler.

Engineered with durability and functionality in mind, this silicone coupler provides a reliable connection for various components in your vehicle's intake or cooling system. Its smooth interior surface promotes efficient airflow, while its flexible and reinforced construction ensures a secure fit and prevents leaks. Enjoy hassle-free installation and enhanced performance with this premium silicone coupler.

• Durable silicone construction
• Smooth interior surface for efficient airflow
• Flexible and reinforced design prevents leaks
• Secure fit for reliable performance
• Hassle-free installation

Upgrade your BMW or MINI with the BMW & MINI Silicone Coupler - Straight 2.38" (60.33mm). This high-quality silicone coupler is designed to provide a secure and leak-free connection for your vehicle's intake or cooling system. Engineered for durability and flexibility, it ensures optimal performance under various conditions. With its straight design and precise dimensions, this silicone coupler offers easy installation and a perfect fit for your BMW or MINI.

• Provides a secure and leak-free connection
• Engineered for durability and flexibility
• Straight design for easy installation
• Perfect fit for BMW and MINI vehicles

ECS Silicone Coupler

Upgrade your BMW with the ECS Silicone Coupler. This straight 3 5/8" ID (92mm) x 3" L coupler is designed to enhance your vehicle's performance and durability. Crafted from high-quality silicone, it ensures long-lasting reliability and superior performance.

• Enhances vehicle performance
• Durable construction for long-lasting reliability
• Specifically designed for BMW vehicles

Enhance your BMW's performance with the Turner Motorsport Exact-Fit High Flow Dry Air Filter, replacing the factory air filter for optimal airflow. This reusable filter offers a higher flow than stock paper filters, instantly improving engine power and fuel economy across the power band. As a direct replacement for the OEM filter, it's a hassle-free performance modification that shows immediate results. Choose between oiled and dry filters based on your preference and maintenance preferences, with both options outperforming OE paper filters. The dry filter, in particular, requires minimal maintenance, making it a cost-effective and efficient choice.

• Enhances engine performance and fuel economy
• Higher flow than OEM paper filters
• Reusable and washable for long-term use
• Direct replacement for the OEM filter
• Choose between oiled and dry filters based on maintenance preference
• Dry filter requires minimal maintenance and no oiling
• Cleaning needed only every 50,000 miles under normal highway driving conditions
• Cost-effective alternative to regularly replacing paper filters

Be sure to check out the full line of filter cleaning supplies Turner Motorsport has to offer!

BMW E46 Crankcase Pressure Regulator Valve | S54 3.2L Engine is a crucial component that ensures proper crankcase ventilation by regulating oil vapor flow into the intake manifold, preventing excessive oil consumption and buildup. Designed specifically for BMW E46 models with the S54 3.2L engine, this valve helps maintain engine efficiency and performance. BMW engines are known to experience oil separator freezing in cold weather if not fully warmed up, which can lead to howling noises and oil leaks. To ensure a thorough repair, replacing the valve cover gasket when changing the separator is highly recommended.

• Regulates crankcase pressure to prevent excessive oil consumption
• Helps maintain proper engine ventilation for peak performance
• Reduces the risk of oil separator freezing and associated leaks
• Direct-fit replacement for BMW E46 models with S54 3.2L engine
• High-quality materials ensure durability and long-lasting performance
• Recommended to replace the valve cover gasket for a complete repair

Protect your BMW's engine from excessive oil consumption and leaks by replacing a failing crankcase pressure regulator valve with this premium-quality replacement.

BMW S54 Silicone Throttle Body Boot Set - With Clamps is an essential upgrade for any BMW S54 engine, designed to replace aging and deteriorating rubber intake boots. Engineered by Turner Motorsport, these silicone throttle body boots provide superior durability and reliability under both street and race conditions, including boosted applications. Unlike simple silicone reducers, these boots are meticulously designed with the same internal features as the originals, ensuring a perfect factory fitment. The three-ply construction offers enhanced strength and longevity, making them slightly thicker than the factory boots. This set includes six boots and compatible clamps, providing a complete solution at a fraction of the cost of OEM replacements.

• Enhanced Durability: Three-ply construction withstands heat cycling, vibrations, and oil exposure.
• Perfect Fit: Designed with factory fitment in mind, including all internal features of the originals.
• Complete Set: Includes six boots and compatible clamps for a full replacement.
• Cost-Effective: Less than half the price of OEM replacement boots.
• Versatile Compatibility: Fits all intake plenums, including US, CSL, and replicas using OE-style boots.

Maximum Flow Pro5R Filter

This intake kit replaces your restrictive factory air box. It features 1.6mm powder-coated steel heat shield, trim sealed to seal out hot engine air, and a custom aFe brand cotton filter.

By removing your stock intake air box, you are removing the most restrictive portion of your M3's intake system, increasing both horse power and torque, improving acceleration as well as throttle response.

This version uses aFe's highest flowing filter media, which uses a lightly oil gauze to filter out dirt and particulates, while allowing more air to flow to the intake. For the best flowing filter, with the best performance gain, we always recommend this standard aFe filter media (often called "Pro5R ", which has a blue pre-oiled filter media). We also carry this filter in the "ProDry" grey filter media, which is oil-free for only slightly less performance and no maintenance.

12 hp gain at 4900 rpm!
11 lb/ft torque at 4900rpm!

This aFe intake fits the following BMWs:
E46 3 series: M3 Coupe, M3 Convertible

Click here for a detailed press sheet

Clickhere for installation instructions.

K&N's drop-in air intake filter is constructed from cotton gauze material between aluminum mesh - this makes for a long lasting, high performance drop-in intake filter. These are very easy to remove and maintain. Turner Motorsport recommends this as one of the first maintenance/modifications you make to your vehicle after you purchase! 

K&N's drop in air filters allow increased airflow - dirt and particles stick to the oil on these filters, making them more effective than traditional paper filters in terms of protection. Additionally, K&N believes their filters are more efficient than paper filers - this means more oxygen getting into the engine, allowing vaporized fuel to burn more efficiently and increasing horsepower and fuel economy. The best of both worlds!

• Covered by the K&N Million Mile Limited Warranty
• Washable and reusable
• Emissions legal in all 50 states
• Will not void vehicle warranty