E46 headers

Types of e46 headers

BMW E46 headers, also knwon as E46 exhaust manifolds, are car components that help channel exhaust gas from the engine to the exhaust system, helping improve overall vehicle performance and sound. The E46 headers are available in various styles and designs, including:

• Stainless steel headers: These E46 headers are made of stainless steel, a really strong and tough alloy steel that doesn't rust or corrode. These types of headers have a higher resistance to rust and corrosion, especially when compared to other types of headers like the cast iron headers. Apart from the headers having a higher resistance to corrosion, stainless steel headers also provide a better flow of exhaust gases, which in turn helps improve the overall performance of the vehicle.
• Long tube headers: Long tube headers are another type of E46 headers. Long tube headers are designed to increase the power and performance of the vehicle. They do this by improving the flow of exhaust gases from the engine. The headers, as the name suggests, have long tubes that channel the exhaust gases from the engine to the vehicle's exhaust system. The longer tubes in these headers help create a stronger vacuum effect, which in turn leads to a better flow of exhaust gases. As a result, the engine can breathe better, which leads to an increase in horsepower and torque. The only downside to long tube headers is that they require more room for installation, which can sometimes make the installation process a bit difficult.
• Shorty headers: Another type of E46 headers is the shorty headers, also referred to as shorty exhaust headers. Shorty headers are quite similar to long tube headers. Both types of headers are designed to improve the performance of the exhaust system by bettering the flow of exhaust gases from the engine. However, shorty headers differ from long tube headers in that they have shorter tubes that channel exhaust gases. The shorter tubes in the headers mean that they are not as effective as long tube headers when it comes to improving exhaust flow. Nevertheless, shorty headers are easier to install, and they also fit well in tight spaces.

Specifications and Maintenance of E46 Headers

Every car header has its own set of specifications that impact its performance and compatibility with different vehicles. Here are some common e46 header specifications;

• Material

  The material of the E46 BMW header plays a critical role in its performance. The most common e46 headers are made of stainless steel. This is because stainless steel headers are durable and resistant to corrosion.

• Surface Finish

  These car headers also have different types of surface finishes that affect their looks and performance. Some have a polished finish which enhances their corrosion resistance and visual appeal. Others have a coated finish which improves durability and resistance to extreme temperatures.

• Pipe Diameter

  The pipe diameter of these headers varies depending on the design and intended application. Generally, the diameter ranges from 1.5 inches to 2.5 inches. A larger pipe diameter on the e46 m3 headers reduces back pressure and improves exhaust flow. On the other hand, smaller pipe diameters improve low-end torque.

• Flange Thickness

  The thickness of the flange on the E46 headers varies based on the model. Typically, the flange thickness ranges from 0.25 inches to 0.5 inches. A thicker flange offers a better seal and reduces the chances of header leaks.

Taking care of e46 headers is important for optimal performance and durability. Here are some general tips on how to maintain e46 headers.

• Regular Inspections

  Inspect the headers regularly to check for any damages, cracks, or rust. Also, inspect the header gaskets and bolts to ensure there are no leaks.

• Cleaning

  These headers should be cleaned regularly to prevent the buildup of dirt and grime. A mild detergent and water should be used for cleaning. Additionally, a specialized header cleaning product can be used to remove tough stains.

• Tightening

  The bolts and nuts holding the headers should be tightened regularly. This is because the constant vibrations from the engine may cause these fasteners to become loose.

• Heat Management

  These headers should be kept away from heat-sensitive components. Also, heat wraps can be used to minimize heat radiation.

How to Choose E46 Headers

Before purchasing E46 headers, it's important to study the market well in order to meet the target customers' needs. Here are some factors to consider when choosing E46 headers:

• Fitment and Compatibility

  When selecting E46 headers for resale, ensure they are compatible with a wide range of BMW models. This will give them a larger market base. While the E46 headers are mainly designed for the E46 3-series BMW, they are also compatible with the E39 5-series and the E60 6-series. They fit the N52 and N54 engines. These headers can be a suitable upgrade for many BMW models.

• Material

  When choosing E46 headers, select those made from stainless steel. The stainless steel headers have great resistance to corrosion and rust. They have a long lifespan and offer great value for the money. Also, they are affordable and give a high return on investment.

• Quality

  Choose E46 headers that are of good quality and premium grade. They should be manufactured using the latest technology. The headers should have a smooth surface finish. This will ensure they are suitable for long-term use.

• Size and Diameter

  The size and diameter of the E46 headers vary. They determine the performance of the headers. For example, headers with a larger diameter offer better performance. However, this isn't suitable for small engines. When reselling, choose a variety of sizes to meet the different needs of clients.

• Brand

  To meet the needs of clients who are specific about brands, choose E46 headers from reputable brands. The headers from well-known brands have a huge market because of their quality.

• Legal Compliance

  When selecting E46 headers, be sure to choose those that comply with the local emission regulations. The headers should be street legal. This will avoid any legal issues that might arise due to non-compliance.

• Performance Gain

  Select E46 headers that offer good performance gain. The headers should increase horsepower and torque. They should improve engine efficiency and provide a better driving experience.

How to DIY and Replace e46 headers

Replacing BMW e46 M3 headers can be a complex task, but with the right tools and mechanical knowledge, it can be done. Below are the steps to take:

Start by gathering all the necessary tools for the job. These include:

• Socket set
• Wrench set
• Torx bits
• Ratchet extension
• Pliers
• Torque wrench
• New gaskets
• New headers

Once all the tools are gathered, take the following steps to replace the headers:

• Disconnect the battery

  For safety's sake, unplug the battery before starting any work on the car.

• Lift the car

  Use a jack to lift the car and secure it with jack stands. This will give enough room to work under the vehicle.

• Remove the undertray

  The next step is to remove the undertray. This will give more access to the exhaust system.

• Remove the intake manifold

  After this, the intake manifold has to be removed. This makes it easier to access the headers.

• Disconnect the exhaust

  Loosen and disconnect the exhaust pipes from the headers. Use a penetrating lubricant to loosen rusted bolts.

• Remove the old headers

  Using a socket set and Torx bits, remove the bolts holding the headers in place. This might require some elbow grease, as the bolts might be rusted.

• Install the new headers

  Mount the new headers and tighten the bolts to the recommended torque specifications, using a torque wrench.

• Reconnect the exhaust

  Reconnect the exhaust pipes to the headers, ensuring a proper seal with the new gaskets.

• Reinstall the intake manifold

  After this, the intake manifold should be reinstalled. Then, reconnect all the vacuum lines and electrical connections.

• Reinstall the undertray

  After the undertray is reinstalled, the next step is to reconnect the battery.

• Lower the car

  Finally, the car is lowered, and the procedure is deemed complete.

Q&A

Q1: What are E46 headers?

A1: E46 headers are exhaust headers made for BMW E46 models. They replace the stock exhaust manifold to improve exhaust flow and increase engine performance.

Q2: What is the benefit of installing E46 headers?

A: E46 headers can improve engine performance, especially in terms of high RPM power. They also change the exhaust note, giving it a sportier sound. In addition, headers can improve engine cooling by reducing heat transfer to the engine bay.

Q3: Are E46 headers legal?

A: Whether E46 headers are legal or not depends on the emissions regulations of a particular region. Some headers are street legal as they conform to emissions standards, while others are not, especially if they eliminate the catalytic converter.

Q4: Can non-BMW headers fit the E46?

A: Non-BMW headers can fit the E46 if they are designed specifically for the car model. However, it is advisable to use headers from reputable brands to ensure proper fitment and performance.

Q5: How much should a header for the E46 cost?

A: The cost of headers for the E46 varies depending on the brand and whether they are E46 M3 headers. While the M3 headers are more expensive, those from generic brands are affordable. Nonetheless, it is important to get headers that are within the budget but of good quality.