Upgrading your 2015 BMW 335i xDrive with a new air intake system is a fantastic way to boost performance and add a bit of flair under the hood. In this comprehensive guide, we'll walk you through everything you need to know about air intakes, why you might want to upgrade, what to look for, and even some installation tips. So, if you're ready to give your Bimmer some extra oomph, let's dive in!

Why Upgrade Your Air Intake?

Okay, guys, let's get real about why you'd even want to swap out your stock air intake. The factory air intake on your 2015 BMW 335i xDrive is designed to do its job efficiently enough for everyday driving. However, it's often restrictive to keep noise levels down and meet emissions standards. An aftermarket air intake, on the other hand, is engineered to maximize airflow to your engine. More air means more oxygen for combustion, which translates to several potential benefits:

• Increased Horsepower and Torque: This is the big one! By allowing your engine to breathe easier, an upgraded air intake can lead to noticeable gains in horsepower and torque. While the exact numbers vary depending on the intake and other modifications, you can generally expect to see improvements in the 5-15 horsepower range.
• Improved Throttle Response: A less restrictive air intake can make your throttle feel more responsive. This means quicker acceleration and a more engaging driving experience. Who doesn't want that?
• Enhanced Engine Sound: Let's be honest, the sound of a turbocharger spooling up is music to any car enthusiast's ears. Many aftermarket air intakes amplify the sound of your engine, giving you a more aggressive and sporty tone. Vroom, vroom!
• Better Fuel Efficiency (Potentially): While not always the primary goal, some drivers report a slight improvement in fuel efficiency after installing an aftermarket air intake. This is because the engine doesn't have to work as hard to draw in air.
• Aesthetics: Let's face it; aftermarket air intakes often look much cooler than the stock ones. Many feature sleek designs and high-quality materials like carbon fiber or polished aluminum, adding a touch of visual appeal to your engine bay.

Types of Air Intakes for Your BMW

When it comes to air intakes for your 2015 BMW 335i xDrive, you'll generally find two main types:

• Cold Air Intakes (CAI): Cold air intakes are designed to draw air from outside the engine bay, where the air is cooler. Cooler air is denser and contains more oxygen, which can further improve performance. CAIs typically involve relocating the air filter to a lower position, often near the fender well.
• Short Ram Intakes (SRI): Short ram intakes, as the name suggests, use a shorter intake tube and position the air filter within the engine bay. SRIs are generally easier to install than CAIs, but they may not provide quite as much of a performance boost since they can draw in warmer air.

Choosing the Right Type:

The best type of air intake for you depends on your priorities and driving conditions. If you're looking for maximum performance and don't mind a slightly more involved installation, a cold air intake is a great choice. However, if you want a simple and affordable upgrade that still offers noticeable benefits, a short ram intake might be a better option. Also, consider your local climate. If you live in a very hot area, a CAI can really help to deliver cooler air to your engine. Think about it.

Key Considerations When Choosing an Air Intake

Alright, so you're sold on the idea of upgrading your air intake. But with so many options on the market, how do you choose the right one for your 2015 BMW 335i xDrive? Here are some key factors to consider:

• Compatibility: This is the most important thing! Make sure the air intake you choose is specifically designed for your 2015 BMW 335i xDrive. Check the product description carefully and verify that it's compatible with your vehicle's year, make, and model. Otherwise, you might end up with an intake that doesn't fit or doesn't function properly.
• Filter Type: Air filters come in various materials, including cotton gauze, synthetic, and foam. Cotton gauze filters are popular for their high airflow and reusability (they can be cleaned and oiled). Synthetic filters offer excellent filtration and durability. Foam filters are often used in off-road applications due to their ability to trap large particles. Choose wisely.
• Construction Quality: Look for an air intake made from high-quality materials like aluminum, carbon fiber, or durable plastic. The intake tube should be smooth and free of any restrictions that could impede airflow. Check the welds and connections to ensure they're strong and secure. You want something that will last.
• Installation: Consider your own mechanical skills and comfort level when choosing an air intake. Some intakes are designed for easy bolt-on installation, while others may require more extensive modifications. Read the installation instructions carefully before you buy and make sure you have the necessary tools and equipment.
• Brand Reputation: Stick with reputable brands that have a proven track record of producing high-quality air intakes. Read online reviews and see what other BMW owners have to say about their experiences with different brands and models. Do your research!
• Price: Air intakes can range in price from a couple of hundred dollars to several hundred dollars or more. Set a budget and stick to it. Keep in mind that the most expensive intake isn't always the best. Focus on finding an intake that offers the best combination of performance, quality, and value for your money.

Installation Tips and Tricks

So, you've got your new air intake, and you're ready to install it. Here are a few tips and tricks to make the process go smoothly:

• Read the Instructions: This may seem obvious, but it's essential to read the installation instructions carefully before you start. Familiarize yourself with the steps involved and make sure you have all the necessary tools and materials.
• Disconnect the Battery: Before you start working on your car, disconnect the negative terminal of the battery. This will help prevent any electrical accidents.
• Take Your Time: Don't rush the installation process. Take your time and be careful not to damage any components. If you're not sure about something, consult the instructions or seek help from a professional.
• Use the Right Tools: Make sure you have the right tools for the job. This may include screwdrivers, wrenches, sockets, pliers, and a torque wrench.
• Tighten Connections: Ensure all connections are tight and secure. Use a torque wrench to tighten bolts to the specified torque values. This will help prevent leaks and ensure proper performance.
• Double-Check Everything: Once you've completed the installation, double-check everything to make sure it's properly installed and connected. Start the engine and listen for any unusual noises. If you notice anything out of the ordinary, shut off the engine and investigate.

Potential Issues and Considerations

While upgrading your air intake is generally a straightforward process, there are a few potential issues and considerations to keep in mind:

• Check Engine Light: In some cases, installing an aftermarket air intake can trigger the check engine light. This is usually due to changes in airflow that the engine control unit (ECU) detects. You may need to reset the ECU or have it reprogrammed to accommodate the new air intake.
• Warranty: Installing an aftermarket air intake may void your vehicle's warranty, especially if the intake is found to be the cause of a problem. Check with your dealer or warranty provider before you install an aftermarket intake.
• CARB Compliance: If you live in California or another state with strict emissions regulations, make sure the air intake you choose is CARB compliant (California Air Resources Board). CARB-compliant intakes have been tested and certified to meet emissions standards.
• MAF Sensor: Be extremely careful when handling the MAF (Mass Air Flow) sensor. This sensor is very delicate and can be easily damaged. Always disconnect the MAF sensor before removing the stock air intake, and be careful not to touch the sensor element.

Final Thoughts

Upgrading the air intake on your 2015 BMW 335i xDrive is a rewarding modification that can improve performance, enhance engine sound, and add a touch of style to your engine bay. By following the tips and considerations outlined in this guide, you can choose the right air intake for your needs and install it with confidence. So, go ahead and give your Bimmer the breath of fresh air it deserves!

Disclaimer: Always consult with a qualified mechanic or performance specialist before making any modifications to your vehicle. Performance gains may vary depending on other modifications and driving conditions.