BMW M2 G87 Exhaust Upgrade Review: ASR Module
Service Price
$150+
Estimated price · Actual price may vary by shop
BMW M2 G87 exhaust controller upgrade with ASR module. Enhances sound by controlling exhaust flaps. Reversible and cost-effective.
BMW M2 G87: Is Stock Exhaust Sound Enough?
The BMW G87 M2 is built for performance, and its potent inline-six engine deserves a commanding soundtrack. However, the stock active exhaust system often remains subdued at lower speeds, with the flaps only opening at higher RPMs. For enthusiasts seeking a more visceral driving experience, the factory setting can feel like a compromise, especially considering global noise regulations.
Fortunately, a practical solution exists: installing an exhaust controller (variable module). This upgrade allows you to control the exhaust flap's position, enabling constant open or closed states without replacing the entire muffler. You gain the ability to tailor the car's sound to your driving situation.
Understanding the Limits of Stock Exhausts
BMW's active exhaust systems are typically designed to be quiet during cruising and louder during spirited driving. For the M2, the exhaust flaps usually open around 4,500 RPM. This means many owners might rarely hear their car's full exhaust note during daily commutes or city driving, leading to dissatisfaction.
Furthermore, the stock system's flaps are electronically controlled by the car's ECU. Even when the exhaust is theoretically 'active,' the flaps only fully open under specific conditions like high RPMs, certain driving modes, or engine temperatures. This prevents the driver from manually controlling the sound at will.
The ASR Exhaust Controller Solution
The ASR exhaust controller module offers a way to reinterpret the stock exhaust system's capabilities. Instead of bypassing the original motor, it takes direct control. This German-engineered module is compatible with the latest M models, including the M2, M3, and M4.
Installation process:
- Lift the vehicle and inspect the undercarriage to locate the stock exhaust system and variable valve motor.
- Disconnect the original motor's connector.
- Connect the ASR module in line with the stock motor connector.
- Route the module's wiring harness neatly, securing it with heat-resistant tape, especially near hot exhaust components.
- Connect the remote control receiver and test functionality.
Using the included remote, you can instantly open or close the exhaust flaps. The installation is straightforward, typically involving plugging the module between the stock wiring harness and the valve motor. This approach is highly reversible, allowing you to return to the stock setup easily. Crucially, it enhances the exhaust sound without the need for expensive muffler replacement.
Frequently Asked Questions
Q. How much does an exhaust & intake upgrade cost for a BMW M2 G87?
The ASR exhaust controller featured in this review costs approximately ₩450,000 (Korean Won). While specific intake upgrade costs vary, a full exhaust and intake system can range from $1,500 to $5,000+ in the US, depending on components and brand.
Q. How long does an exhaust & intake upgrade last on a BMW M2 G87?
An exhaust controller module like the ASR unit is designed for long-term durability, typically lasting the lifetime of the vehicle with proper installation. Regular checks for secure connections and avoiding physical damage are recommended maintenance.
Q. Is an exhaust & intake upgrade worth it for a BMW M2 G87?
An exhaust controller is highly recommended for G87 M2 owners who desire more control over their car's sound without modifying the stock muffler. It offers significant auditory enhancement and driving engagement for a reasonable cost.
Q. How is an exhaust & intake upgrade done on a BMW M2 G87?
Installation involves accessing the stock exhaust valve motor, disconnecting its wiring, and inserting the control module in line. The module's wiring is then routed safely, often secured with heat-resistant tape, and connected to the remote receiver.
Q. What is the best exhaust & intake upgrade option for a BMW M2 G87?
For enhancing exhaust sound without replacing the muffler, the ASR variable module is an excellent, reversible option that provides instant flap control via remote. For intake, options range from high-flow filters to full cold air intake systems, depending on desired performance gains and sound.
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