BMW 335i N55: Best Cold Air Intake (2011)

by Alex Braham 42 views

Hey guys! Are you looking to boost the performance of your 2011 BMW 335i with an N55 engine? One of the most popular upgrades you can make is installing a cold air intake. A cold air intake can improve horsepower and torque and even add a sporty sound to your engine. However, with so many options on the market, finding the best cold air intake for your specific needs can be challenging. Don't worry; this guide will walk you through everything you need to know to make an informed decision.

Why Upgrade to a Cold Air Intake?

Before diving into specific products, let's understand why a cold air intake is a worthwhile upgrade for your BMW 335i N55. The primary function of a cold air intake is to provide the engine with a cooler and denser air supply. Cooler air contains more oxygen, and when your engine receives more oxygen, it can burn more fuel, resulting in increased power. Stock air intake systems are often restrictive and draw air from the engine bay, where temperatures are high. Cold air intakes, on the other hand, are designed to draw air from outside the engine bay, typically from the front of the car, where the air is cooler. This simple change can lead to several benefits:

  • Increased Horsepower and Torque: By providing a greater volume of cooler air, the engine can produce more power. The exact gains vary depending on the specific intake and the engine's tuning, but it’s not uncommon to see increases of 5-15 horsepower.
  • Improved Throttle Response: A less restrictive intake system allows the engine to breathe easier, leading to quicker throttle response. This means the car feels more responsive when you press the accelerator.
  • Enhanced Engine Sound: Many cold air intakes add a more aggressive and sporty sound to the engine. You'll typically hear more of the turbocharger spooling and a deeper intake note.
  • Better Fuel Efficiency: In some cases, a cold air intake can improve fuel efficiency, especially when combined with other performance upgrades and proper tuning. However, this is not always guaranteed and depends on driving habits.

Factors to Consider When Choosing a Cold Air Intake

Choosing the right cold air intake involves considering several key factors to ensure you get the best performance and fit for your 2011 BMW 335i N55. Let's break down the most important aspects:

  • Filter Type: The air filter is a critical component of any cold air intake. There are two main types: oiled and dry filters. Oiled filters, typically made of cotton gauze, offer excellent filtration and can be cleaned and re-oiled. However, they require more maintenance and can potentially damage the mass airflow sensor (MAF) if over-oiled. Dry filters, usually made of synthetic materials, are easier to maintain, requiring only occasional cleaning. They generally offer slightly less filtration than oiled filters but are a safer option for your MAF sensor.
  • Intake Material: Cold air intakes are commonly made from either aluminum or plastic. Aluminum intakes are durable and can help dissipate heat, keeping the intake air cooler. They often have a more premium look. Plastic intakes are lighter and less expensive but may not offer the same level of heat dissipation. The choice depends on your budget and performance priorities.
  • Design and Placement: The design of the intake and its placement in the engine bay are crucial. Look for intakes that are designed to minimize bends and restrictions, allowing for smoother airflow. The intake should also be positioned to draw air from the coolest possible location, away from the engine's heat. Some intakes include heat shields to further protect against heat soak.
  • Fitment and Installation: Ensure the cold air intake is specifically designed for the 2011 BMW 335i N55. A proper fit ensures easy installation and optimal performance. Check if the intake comes with all necessary hardware and instructions. Some intakes are designed for DIY installation, while others may require professional installation.
  • CARB Compliance: If you live in California or another state with strict emissions regulations, check whether the cold air intake is CARB (California Air Resources Board) compliant. A CARB-compliant intake has been tested and approved for use in these states and will not cause you to fail an emissions test.

Top Cold Air Intakes for the 2011 BMW 335i N55

Alright, let’s get to the good stuff! Based on performance, quality, and customer reviews, here are some of the top cold air intakes for your 2011 BMW 335i N55:

  1. aFe Power Magnum FORCE Stage-2 Cold Air Intake System: aFe Power is a well-known brand in the performance aftermarket, and their Magnum FORCE intake is a top contender for the N55. This intake features a high-flow oiled filter and a durable aluminum intake tube. It’s designed to provide maximum airflow and improved throttle response. The aFe Power Magnum FORCE intake often results in noticeable gains in horsepower and torque. It's a bit more expensive, but the quality and performance justify the cost.

  2. Injen Technology SP Series Cold Air Intake System: The Injen SP Series intake is another excellent option, known for its innovative design and performance gains. It features a patented MR Technology tuning process, which optimizes the intake for maximum power. The Injen intake uses a dry filter, making it easy to maintain. It is available in multiple finishes to match your engine bay aesthetics. This intake is a great balance of performance, price, and ease of maintenance.

  3. Burger Motorsports BMS Cold Air Intake: For those looking for a more budget-friendly option that still delivers impressive results, the Burger Motorsports BMS intake is worth considering. This intake features a simple yet effective design and uses a high-flow filter. It’s easy to install and provides a noticeable improvement in throttle response and engine sound. While it may not offer the same peak horsepower gains as some of the more expensive options, it’s an excellent value for the money. It is very popular within the BMW community.

  4. K&N 57i Series Air Intake System: K&N is a household name in air filtration, and their 57i Series intake is a solid choice for the N55. This intake features a high-flow oiled filter and a heat shield to protect against heat soak. K&N intakes are known for their durability and performance. The 57i Series intake provides a good balance of performance and value, and it's a reliable option for those looking to upgrade their intake system. It’s also CARB compliant in many cases, making it a safe choice for those in California.

Installation Tips and Considerations

Installing a cold air intake on your 2011 BMW 335i N55 is generally a straightforward process, but here are some tips to ensure a smooth installation:

  • Read the Instructions: Always read the installation instructions carefully before starting. Familiarize yourself with the steps and ensure you have all the necessary tools.
  • Disconnect the Battery: Disconnect the negative battery terminal before starting any work on the car's electrical system. This prevents accidental shorts and damage to the car's electronics.
  • Take Your Time: Don't rush the installation process. Take your time and double-check each step to ensure everything is properly installed. If you’re not comfortable doing it yourself, consider having a professional install the intake.
  • Clean the MAF Sensor: Before installing the new intake, clean the mass airflow (MAF) sensor with a MAF sensor cleaner. This ensures accurate readings and prevents potential issues.
  • Properly Seat the Filter: Make sure the air filter is properly seated and secured to the intake tube. This prevents unfiltered air from entering the engine, which can cause damage.
  • Check for Leaks: After installation, start the engine and check for any air leaks around the intake connections. Address any leaks immediately to ensure optimal performance.

Maintaining Your Cold Air Intake

Proper maintenance is essential to keep your cold air intake performing at its best. Here are some tips for maintaining your intake:

  • Clean the Filter Regularly: Depending on the type of filter, clean it every 10,000 to 25,000 miles. Oiled filters need to be cleaned and re-oiled, while dry filters simply need to be cleaned. Follow the manufacturer's instructions for cleaning and oiling.
  • Inspect the Intake Tube: Regularly inspect the intake tube for any cracks, damage, or loose connections. Replace any damaged components to prevent air leaks.
  • Monitor Performance: Keep an eye on your car's performance. If you notice any decrease in power or fuel efficiency, it may be a sign that the intake needs maintenance.

Conclusion

Upgrading to a cold air intake is a great way to improve the performance and sound of your 2011 BMW 335i N55. By considering factors like filter type, intake material, design, and fitment, you can choose the best intake for your needs. Whether you opt for the aFe Power Magnum FORCE, Injen SP Series, Burger Motorsports BMS, or K&N 57i Series, you’ll enjoy improved throttle response, increased horsepower, and a more aggressive engine sound. Remember to follow the installation tips and maintenance guidelines to keep your intake performing at its best. Happy driving!