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The E30 M20 intake manifold swap is a popular modification among BMW enthusiasts looking to boost the performance of their vehicles without breaking the bank. For around $400, you can expect to see a noticeable increase in horsepower and torque, making this swap a worthwhile investment for many. In this article, we will explore the details of the E30 M20 intake manifold swap, the expected power gains, and the overall impact on performance.
Understanding the E30 M20 Engine
The BMW E30, produced from 1982 to 1994, is known for its lightweight chassis and balanced handling. The M20 engine, a 2.5-liter inline-six, is a favorite among enthusiasts due to its potential for tuning and modification. This engine’s design allows for various upgrades, including an intake manifold swap that can significantly enhance its performance.
Why Swap the Intake Manifold?
The stock intake manifold on the M20 engine is restrictive, limiting airflow and, consequently, power output. By swapping it for a higher-flow aftermarket or a different OEM manifold, you can improve airflow to the engine, resulting in better combustion and increased power. Here are some reasons why enthusiasts opt for this modification:
- Improved airflow and throttle response
- Increased horsepower and torque
- Enhanced engine sound
- Cost-effective performance upgrade
Choosing the Right Intake Manifold
When considering an intake manifold swap, it’s essential to choose the right one for your goals. Some popular options include:
- E30 M3 Manifold: Known for its performance gains, it provides a significant increase in airflow.
- Aftermarket Options: Brands like Ireland Engineering and Turner Motorsport offer high-performance manifolds designed for the M20 engine.
- Custom Fabricated Manifolds: For those looking for a unique solution, custom options can be tailored to specific performance needs.
Installation Process
The installation of an intake manifold can be straightforward, but it requires some mechanical knowledge. Here’s a general overview of the steps involved:
- Gather Tools and Parts: Ensure you have all necessary tools, gaskets, and the new manifold.
- Remove the Old Manifold: Disconnect the battery, remove air intake components, and unbolt the existing manifold.
- Prepare the New Manifold: Clean any surfaces and attach new gaskets to ensure a proper seal.
- Install the New Manifold: Bolt the new manifold in place and reconnect all components.
- Test the Installation: Start the engine and check for any leaks or issues.
Expected Power Gains
One of the most exciting aspects of the E30 M20 intake manifold swap is the potential power gains. While results can vary based on the specific manifold and supporting modifications, here are some general expectations:
- Horsepower Increase: Many users report gains of 10 to 20 horsepower.
- Torque Improvement: Torque can also see a boost, often in the range of 10 to 15 lb-ft.
- Overall Performance: Improved throttle response and mid-range power are commonly experienced.
Additional Modifications to Consider
To maximize the benefits of the intake manifold swap, consider pairing it with other modifications. Some suggestions include:
- Upgraded Exhaust System: A less restrictive exhaust can complement the increased airflow from the new manifold.
- ECU Tuning: Adjusting the engine’s tuning can help optimize performance after the swap.
- Cold Air Intake: A cold air intake can further improve airflow and performance.
Conclusion
The E30 M20 intake manifold swap is an excellent way to enhance your BMW’s performance for a reasonable cost. With expected power gains of 10 to 20 horsepower and improved throttle response, this modification is a favorite among enthusiasts. By carefully selecting the right manifold and considering additional upgrades, you can transform your E30 into a more powerful and enjoyable driving experience.