Definition and Purpose of Exhaust Rear Boxes

Exhaust Rear Boxes (Mufflers): An exhaust rear box, commonly referred to as a muffler, is a crucial component of a vehicle’s exhaust system. It is designed to reduce the noise produced by the engine’s exhaust gases before they are expelled from the vehicle.

Purpose:

1. Noise Reduction: The primary purpose of the rear box/muffler is to minimize the noise created by the exhaust gases exiting the engine. It contains a series of chambers and perforated tubes that reflect and absorb sound waves, thus reducing the noise level.
2. Exhaust Flow Management: While primarily designed to reduce noise, mufflers also help manage the flow of exhaust gases, which can have a subtle impact on the performance and efficiency of the vehicle.
3. Emission Control: Some mufflers are equipped with additional components to aid in reducing emissions, although this is more commonly managed by other parts of the exhaust system like catalytic converters.

Position within the Exhaust System: The rear box is located towards the end of the exhaust system. It is usually the last component that exhaust gases pass through before being expelled out of the tailpipe. The typical sequence of an exhaust system is as follows:

1. Exhaust Manifold/Headers: Collects exhaust gases from the engine cylinders.
2. Catalytic Converter: Reduces harmful emissions.
3. Resonator (optional): Further modifies sound and reduces noise.
4. Exhaust Rear Box/Muffler: Reduces noise and manages exhaust flow.
5. Tailpipe: The final section through which exhaust gases are expelled.

Tailpipes and Trims

Tailpipe: A tailpipe is the final piece of the exhaust system that protrudes from the rear of the vehicle, allowing exhaust gases to exit into the atmosphere. It can vary in shape and size and often contributes to the aesthetic appeal of the vehicle.

Trims: Trims are decorative elements attached to the end of the tailpipe. They can be purely aesthetic, providing a polished look, or functional, helping to direct exhaust flow or enhance sound.

Customization Options Offered by MIJ

MIJ offers a variety of customizable rear boxes with different styles and tips to suit customer preferences. Here are some options available:

1. Japstyle Boxes: These rear boxes come with japstyle tips, which are typically larger and can be of various sizes to match different aesthetic preferences.
2. Curled Down Tip Boxes: These feature tips that curl downward, often preferred for a more subtle appearance or to direct exhaust gases downward.
3. Pie Cut Tips: Rear boxes with tips that have a distinctive pie cut design, providing a unique look and potentially altering the exhaust note.

Custom Tailpipe Welding

MIJ provides the option to weld any desired tailpipe or trim to the rear box. If a customer finds a specific tailpipe on MIJ’s store that they like, they can request for it to be welded onto their chosen rear box, ensuring a custom fit and personalized look.

Definition and Purpose of Exhaust dB Killers

Exhaust dB Killers: Exhaust dB killers, also known as silencers or noise reducers, are inserts that can be placed inside the exhaust tips. These are particularly useful for reducing the decibel (dB) levels of the exhaust sound, making the vehicle quieter and more compliant with noise regulations.

Purpose:

1. Noise Reduction: The primary purpose of dB killers is to reduce the overall sound level of the exhaust system. They achieve this by restricting the exhaust flow and using sound-absorbing materials or specific designs to diminish the noise.
2. Regulatory Compliance: In many regions, there are legal limits on the noise levels that vehicles can produce. dB killers help vehicles meet these regulations without the need for a complete exhaust system overhaul.
3. Versatility: dB killers provide an easy and reversible way to modify the exhaust sound. They can be inserted or removed depending on the driver’s preference or regulatory needs.

Position within the Exhaust System

Position: dB killers are typically inserted into the exhaust tips, particularly at the very end of the exhaust system. They are designed to fit within the tailpipes and are often used in conjunction with specific exhaust tips like the japstyle tips offered by MIJ.

MIJ Exhaust Customization

MIJ Exhaust provides a range of exhaust components and customization options, including dB killers for their japstyle exhaust tips.

Customization Options:

1. Sizes and Fitment: dB killers come in various sizes to fit different exhaust tip diameters, ensuring a snug and secure fit.
2. Materials and Designs: They can be made from high-quality materials like stainless steel to withstand the heat and pressure of the exhaust gases. Different designs are available to achieve varying levels of noise reduction.
3. Easy Installation and Removal: dB killers are designed for easy insertion and removal, allowing users to switch between a quieter and a louder exhaust note as needed.

Summary

Exhaust dB Killers:

• Definition: Inserts placed inside exhaust tips to reduce the sound levels of the exhaust system.
• Purpose: Noise reduction, regulatory compliance, and providing versatility in exhaust sound modification.
• Position: Located within the exhaust tips at the end of the exhaust system.

Customization by MIJ:

• Sizes and Fitment: Various sizes to match different exhaust tip diameters.
• Materials and Designs: High-quality materials and different designs for effective noise reduction.
• Easy Installation and Removal: Designed for user convenience to adjust the exhaust sound as needed.

By offering dB killers, MIJ provides a practical solution for customers who need to reduce the noise levels of their vehicles while maintaining the performance and aesthetics of their customized exhaust systems.