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The Audi S4 is a high-performance vehicle that combines luxury with power. One of the most popular modifications among enthusiasts is the installation of a Milltek Sport Cat-back exhaust system. This upgrade not only enhances the sound of the vehicle but also improves performance. In this article, we will provide a detailed, step-by-step guide on how to install a Milltek Sport Cat-back exhaust on the Audi S4, along with the results you can expect.
Tools and Materials Needed
- Milltek Sport Cat-back exhaust system
- Socket set (including 13mm and 15mm sockets)
- Ratchet and extensions
- Torque wrench
- Jack and jack stands
- Safety goggles
- Gloves
- WD-40 or penetrating oil
- Cutting tool (if necessary)
Preparation
Before starting the installation, ensure that your Audi S4 is parked on a flat surface and the engine is cool. Gather all the necessary tools and materials listed above. It’s also recommended to wear safety goggles and gloves to protect yourself during the installation process.
Step 1: Raise the Vehicle
Using a jack, lift the Audi S4 and secure it with jack stands. Ensure the car is stable before proceeding. This will give you better access to the exhaust system.
Step 2: Remove the Stock Exhaust
Locate the stock exhaust system. Start by spraying the exhaust hangers with WD-40 or penetrating oil to help loosen them. Use the socket set to remove the bolts connecting the exhaust to the downpipe. Be cautious as the bolts may be rusted or seized.
Once the bolts are removed, carefully detach the exhaust from the hangers. If necessary, use a cutting tool to remove any sections that are difficult to detach. Once the stock exhaust is fully removed, set it aside.
Step 3: Install the Milltek Sport Cat-back Exhaust
Begin by positioning the Milltek Sport Cat-back exhaust under the vehicle. Align it with the hangers and the downpipe connection. It’s important to ensure that everything is lined up correctly before tightening any bolts.
Attach the exhaust to the downpipe using the provided bolts. Use the torque wrench to tighten the bolts to the manufacturer’s specifications. Next, slide the exhaust hangers onto the exhaust system, ensuring they are securely in place.
Step 4: Check Alignment and Tighten Everything
Once the exhaust is installed, double-check the alignment. Ensure that there is adequate clearance from the underside of the vehicle. If everything looks good, go ahead and tighten all the bolts securely.
Step 5: Lower the Vehicle
Carefully lower the Audi S4 back to the ground using the jack. Remove the jack stands and ensure that the vehicle is stable before starting the engine.
Step 6: Start the Engine and Test
Start the engine and let it idle for a few minutes. Listen for any unusual noises that may indicate a leak or improper installation. If everything sounds good, take the car for a test drive to experience the new exhaust note and improved performance.
Results and Conclusion
After installing the Milltek Sport Cat-back exhaust, many drivers report a deeper, more aggressive sound that enhances the driving experience. Additionally, the performance improvements can be felt, particularly in throttle response and overall power delivery.
In conclusion, installing a Milltek Sport Cat-back exhaust on your Audi S4 is a rewarding project that can significantly enhance both sound and performance. With the right tools and a little patience, you can achieve professional results in your own garage.