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The BMW 335i is a powerful vehicle known for its performance and driving experience. One of the most effective modifications to enhance its power is installing a downpipe. This article will guide you through the process of installing a downpipe on your BMW 335i, whether you choose the M Performance option or an aftermarket alternative. By following these steps, you can unlock an impressive 25+ horsepower.
Understanding Downpipes
A downpipe is a crucial component of the exhaust system, connecting the turbocharger to the rest of the exhaust system. By replacing the factory downpipe with a high-performance option, you can improve exhaust flow, reduce turbo lag, and increase horsepower. This modification is popular among enthusiasts looking to maximize the performance of their BMW 335i.
Choosing the Right Downpipe
When selecting a downpipe for your BMW 335i, you have two primary options: the M Performance downpipe or an aftermarket downpipe. Here’s a breakdown of both choices:
- M Performance Downpipe: Designed specifically for BMW vehicles, this option ensures compatibility and performance. It often comes with warranty coverage.
- Aftermarket Downpipe: These options are typically less expensive and can offer greater performance gains. However, quality and fitment can vary greatly between manufacturers.
Tools and Materials Needed
Before starting the installation process, gather the following tools and materials:
- Socket set
- Torque wrench
- Jack and jack stands
- Safety glasses
- Gloves
- New downpipe (M Performance or aftermarket)
- Exhaust gaskets (if needed)
- Anti-seize compound
Installation Steps
Follow these steps carefully to install your BMW 335i downpipe:
Step 1: Prepare the Vehicle
Start by parking your BMW 335i on a flat surface. Engage the parking brake and lift the front of the car using a jack. Secure it with jack stands for safety.
Step 2: Remove the Undertray
If your vehicle has an undertray, remove it by unscrewing the bolts that hold it in place. This will provide access to the exhaust system.
Step 3: Disconnect the Exhaust
Locate the exhaust clamps connecting the downpipe to the rest of the exhaust system. Use a socket wrench to loosen and remove these clamps. Carefully disconnect the downpipe from the turbocharger.
Step 4: Remove the Old Downpipe
Once disconnected, remove the old downpipe from the vehicle. You may need to maneuver it slightly to get it out. Be cautious of any sharp edges.
Step 5: Install the New Downpipe
Position the new downpipe in place, ensuring it aligns correctly with the turbocharger and exhaust system. If your new downpipe came with new gaskets, install them as well.
Step 6: Secure the Downpipe
Reattach the exhaust clamps to secure the downpipe to the rest of the exhaust system. Ensure everything is tightened properly to avoid leaks.
Step 7: Reinstall the Undertray
If you removed an undertray, reinstall it by securing it with the bolts you removed earlier. This helps protect the exhaust components.
Step 8: Lower the Vehicle
Carefully lower the vehicle back to the ground using the jack. Make sure to remove the jack stands before lowering.
Step 9: Test the Installation
Start the engine and let it idle for a few minutes. Listen for any abnormal sounds or leaks. If everything sounds good, take your BMW 335i for a test drive to experience the improved performance.
Conclusion
Installing a downpipe on your BMW 335i is a straightforward process that can significantly enhance your vehicle’s performance. Whether you choose the M Performance or an aftermarket option, this modification can unlock 25+ horsepower and provide a more exhilarating driving experience. Always remember to follow safety precautions and consult with a professional if you’re unsure about any steps in the installation process.