Hey guys! Are you looking to boost the performance of your 2011 BMW 335i N55? One of the easiest and most effective ways to do that is by installing a cold air intake. In this guide, we'll dive deep into the world of cold air intakes for your specific model, helping you make the best choice for your needs and budget. Let's get started!

    Understanding Cold Air Intakes

    Before we jump into specific recommendations, let's quickly cover what a cold air intake actually does. A cold air intake (CAI) is an aftermarket replacement for your car's factory air intake system. The primary goal is to increase the amount of cooler air flowing into your engine. Cooler air is denser, containing more oxygen per volume, which allows the engine to burn more fuel and create more power.

    The factory air intake systems are often restrictive, designed to minimize noise and meet emissions standards rather than maximize performance. Aftermarket cold air intakes typically use a larger diameter intake tube and a less restrictive air filter, allowing for greater airflow. Additionally, they often position the air filter in a location where it can draw cooler air from outside the engine bay, hence the name "cold air intake".

    Benefits of Installing a Cold Air Intake:

    • Increased Horsepower and Torque: This is the main reason most people install a CAI. By providing the engine with more cool air, it can produce more power.
    • Improved Throttle Response: A less restrictive intake can make your car feel more responsive when you press the gas pedal.
    • Enhanced Engine Sound: Many CAIs add a more aggressive and sporty sound to your engine, especially under acceleration.
    • Better Fuel Economy (Potentially): While not always guaranteed, some users report a slight improvement in fuel economy due to the engine running more efficiently.

    Key Considerations When Choosing a Cold Air Intake

    Okay, so you're sold on the idea of a cold air intake. But with so many options available, how do you choose the right one for your 2011 BMW 335i N55? Here are some crucial factors to consider:

    • Compatibility: This is the most obvious, but it's worth emphasizing. Make sure the intake you choose is specifically designed for the 2011 BMW 335i with the N55 engine. Manufacturers often list compatible models, so double-check before you buy.
    • Filter Type: Air filters come in a variety of materials, including oiled cotton, dry synthetic, and foam. Oiled cotton filters are known for their excellent filtration and ability to be cleaned and reused. Dry synthetic filters are also reusable and require no oiling, making them a bit easier to maintain. Foam filters are less common but offer good filtration and airflow.
    • Intake Tube Material: Intake tubes are typically made from aluminum, plastic, or carbon fiber. Aluminum is a good conductor of heat, so it's important that it's shielded or coated to prevent heat soak. Plastic is a less expensive option and doesn't conduct heat as readily. Carbon fiber is lightweight and strong, but it's also the most expensive.
    • Location of the Air Filter: As mentioned earlier, the location of the air filter is crucial for drawing in cooler air. Some intakes place the filter in the engine bay, which can still be an improvement over the stock intake, but the best options position the filter outside the engine bay, near the fender or behind the bumper.
    • Ease of Installation: Some cold air intakes are designed for easy, DIY installation, while others may require more extensive modifications or professional installation. Consider your own mechanical skills and comfort level when making your decision.
    • Price: Cold air intakes can range in price from a couple of hundred dollars to over a thousand. Set a budget and stick to it.
    • CARB EO Number: If you live in California or another state that follows California's emissions standards, make sure the intake you choose has a CARB EO (California Air Resources Board Executive Order) number. This means that the intake has been tested and approved for use on your vehicle in California.

    Top Cold Air Intake Recommendations for Your 2011 BMW 335i N55

    Alright, let's get down to the nitty-gritty! Based on the considerations above, here are a few highly recommended cold air intakes for your 2011 BMW 335i N55:

    1. aFe Power Magnum FORCE Stage-2 Si Cold Air Intake System: aFe (Advanced Flow Engineering) is a well-respected brand in the aftermarket performance industry, and their Magnum FORCE Stage-2 Si intake is a popular choice for the N55 engine. It features a high-flow air filter, a heat-shielded intake tube, and a claimed power increase of up to 18 horsepower and 27 lb-ft of torque. This kit often includes a reusable oiled cotton filter for superior filtration and airflow. The enclosed airbox helps to keep hot engine air away from the filter, maximizing the intake of cool air.

    2. Injen Technology SP Series Cold Air Intake System: The Injen SP Series is another excellent option. It features a mandrel-bent aluminum intake tube, a reusable air filter, and a heat shield. Injen is known for its quality construction and performance gains. This intake is designed to provide optimal airflow and improve throttle response. The heat shield helps prevent heat soak, ensuring that the intake air remains cool. Many users appreciate the aggressive sound this intake provides.

    3. Burger Motorsports (BMS) Performance Intake: The BMS intake is a simpler and more affordable option that still offers significant performance gains. It uses a high-flow filter and a less restrictive intake tube to improve airflow. While it may not offer the same level of heat shielding as some of the more expensive options, it's a great choice for those on a budget. The BMS intake is known for its easy installation and noticeable improvement in engine sound. It’s a popular choice among BMW enthusiasts for its balance of performance and affordability.

    4. K&N 69 Series Typhoon Cold Air Intake Kit: K&N is a household name in air filtration, and their 69 Series Typhoon intake is a solid choice for the N55. It features a washable and reusable air filter, a mandrel-bent aluminum intake tube, and a heat shield. K&N intakes are known for their durability and performance. This kit is designed to increase horsepower and torque, while also providing a sporty engine sound. The heat shield helps to isolate the filter from engine heat, ensuring cool air intake.

    Installation Tips

    Before you start wrenching, here are a few tips to make the installation process smoother:

    • Read the Instructions Carefully: This may seem obvious, but it's crucial. Make sure you understand each step before you start disassembling anything.
    • Gather Your Tools: Ensure you have all the necessary tools on hand, including sockets, wrenches, screwdrivers, and possibly a torque wrench.
    • Disconnect the Battery: This is a safety precaution to prevent any electrical shorts.
    • Take Your Time: Don't rush the process. Take breaks if you need to, and double-check your work as you go.
    • Watch Installation Videos: YouTube is your friend! There are tons of videos showing the installation process for various cold air intakes on the N55 engine.

    Post-Installation Considerations

    Once you've installed your new cold air intake, there are a few things to keep in mind:

    • Check for Error Codes: After starting your car, check for any error codes. If you get a code related to the mass airflow (MAF) sensor, double-check the connection and make sure the sensor is properly installed.
    • Listen for Unusual Noises: Pay attention to any unusual noises coming from the engine bay. If you hear anything out of the ordinary, investigate immediately.
    • Clean Your Air Filter Regularly: Depending on the type of filter you have, you'll need to clean it periodically to maintain optimal performance. Follow the manufacturer's instructions for cleaning and oiling (if applicable).
    • Consider a Tune: While not always necessary, a tune can help you get the most out of your cold air intake. A tune can optimize the engine's air-fuel ratio and timing to take full advantage of the increased airflow.

    Conclusion

    So, there you have it – a comprehensive guide to choosing the best cold air intake for your 2011 BMW 335i N55. By considering the factors outlined in this guide and carefully choosing the right intake for your needs, you can unlock more power, improve throttle response, and enjoy a more engaging driving experience. Happy modding!

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