why does my BMW 3 Series G20/G21 (2019-2024) have a loud exhaust noise?

Solution

1. Preparation

• Tools Required: Safety glasses, gloves, jack and jack stands, socket set, OBD-II scanner, flashlight.
• Ensure the vehicle is parked on a flat surface, and the engine is cool before starting any work.

2. Inspect and Repair Exhaust System

• Sub-steps:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Visually inspect the entire exhaust system from the engine to the tailpipe for any signs of damage, such as holes or rust.
  3. If any damage is found, determine whether to replace the affected section or the entire exhaust component.
  4. If hangers are damaged, replace them to secure the exhaust system properly.

3. Repair or Replace Muffler

• Sub-steps:
  1. If the muffler is damaged or excessively worn, disconnect it from the piping using a socket set.
  2. Remove the old muffler and replace it with a new one, ensuring it matches OEM specifications.
  3. Secure the new muffler in place, tightening all connections to the manufacturer's torque specifications.

4. Test for Exhaust Leaks

• Sub-steps:
  1. Start the engine and allow it to idle.
  2. Use your hand to feel for any escaping air around joints and connections in the exhaust system.
  3. If leaks are detected, use exhaust tape or sealant as a temporary fix, or replace the affected section permanently.