Table of Contents
Installing a MagnaFlow turbo downpipe on your Subaru STI can significantly enhance your vehicle’s performance. This guide provides a step-by-step approach to ensure a successful installation. Follow these steps carefully for the best results.
Tools and Materials Needed
- MagnaFlow Turbo Downpipe
- Socket set
- Wrench set
- Torque wrench
- Jack and jack stands
- Safety goggles
- Gloves
- Exhaust gasket (if needed)
- Anti-seize compound
Preparation
Before starting the installation, ensure your vehicle is parked on a flat surface and the engine is cool. Gather all necessary tools and materials.
1. Lift the Vehicle
Use a jack to lift the front of your Subaru STI and secure it with jack stands. This will provide you with enough space to work under the vehicle.
2. Remove the Undertray
If your STI has an undertray, remove it by unscrewing the bolts or clips holding it in place. This will give you access to the downpipe area.
Removing the Stock Downpipe
With the undertray removed, it’s time to take out the stock downpipe. Follow these steps:
1. Disconnect the Exhaust System
Locate the bolts connecting the stock downpipe to the rest of the exhaust system. Use your socket set to remove these bolts. It may help to spray some penetrating oil on the bolts beforehand to make removal easier.
2. Unbolt the Downpipe from the Turbo
Next, unbolt the downpipe from the turbocharger. Carefully remove any heat shields that may be obstructing access. Keep track of all bolts and nuts for reinstallation.
3. Remove the Downpipe
Once all bolts are removed, gently pull the downpipe away from the turbo and exhaust system. Be cautious of any remaining gaskets or debris that may fall.
Installing the MagnaFlow Turbo Downpipe
Now that the stock downpipe is removed, it’s time to install the new MagnaFlow turbo downpipe. Follow these steps carefully:
1. Prepare the New Downpipe
Before installation, compare the new downpipe with the old one to ensure proper fitment. Apply anti-seize compound to the bolts to prevent future seizing.
2. Position the New Downpipe
Align the MagnaFlow downpipe with the turbo and exhaust system. Ensure that the flange is seated properly against the turbocharger.
3. Bolt the Downpipe to the Turbo
Using the original bolts or new ones if provided, secure the downpipe to the turbo. Tighten the bolts to the manufacturer’s specified torque settings.
4. Connect the Downpipe to the Exhaust System
Next, connect the downpipe to the rest of the exhaust system. Ensure all connections are tight and secure.
Final Steps
With the downpipe installed, it’s time to complete the installation process:
1. Reinstall the Undertray
If you removed an undertray, reattach it using the original bolts or clips. Ensure it is secure and properly aligned.
2. Lower the Vehicle
Carefully lower the vehicle back to the ground using the jack. Make sure everything is clear from under the car before lowering.
3. Check for Leaks
Start the engine and let it idle for a few minutes. Check for any exhaust leaks around the downpipe connections. If you notice any leaks, turn off the engine and tighten the connections as needed.
Conclusion
Installing a MagnaFlow turbo downpipe on your Subaru STI can greatly improve performance and sound. By following this step-by-step guide, you can ensure a successful installation. Always remember to work safely and consult a professional if you are unsure about any step in the process.