If you’re looking to upgrade your Dodge Challenger’s rear end with a more aggressive and functional rear diffuser, the Vicrez BL vz102490 is an excellent choice. This diffuser not only enhances the car’s aerodynamics but also comes with an integrated brake light for added style and safety.
In this step-by-step guide, we’ll walk you through the installation process, including wiring the brake light for a seamless OEM-like fit.
Tools & Materials Needed
- Vicrez vz102490 Diffuser (includes hardware)
- Screwdriver set
- Voltage meter (for wiring)
- Wire strippers & solder (optional)
- Extra wiring (if needed for extension)
- Zip ties (for wire management)
Step 1: Removing the Old Diffuser
Before installing the new diffuser, you’ll need to remove the existing one. If you’re replacing an OEM diffuser.
- Carefully unclip the diffuser from the bumper by releasing the retaining clips.
- Remove any screws or fasteners holding it in place.
- Gently pull the diffuser away from the bumper.
Step 2: Assembling the Vicrez Diffuser
The Vicrez diffuser comes in multiple pieces that need to be assembled before installation.
- Attach the Side Fins
- Use the included silver screws to secure the fins to the main diffuser body.
- Ensure they are aligned properly before tightening.
- Install the Black Support Tabs
- Slide the plastic tabs into place and secure them with the provided black screws.
- These help reinforce the diffuser’s mounting points.
- Attach the Brake Light
- The diffuser includes an LED brake light that mounts using the same silver screws.
- Secure it in place before mounting the diffuser to the car.
Step 3: Wiring the Brake Light
This diffuser includes a functional brake light, so you’ll need to tap into your Challenger’s existing brake light wiring.
Locating the Correct Wires
- Access the Brake Light Wiring
- Open the trunk and locate the wiring harness for the rear brake lights.
- Unplug the connector to expose the wires.
- Identify the Positive & Ground Wires
- Use a voltage meter to find the correct wires:
- Black wire = Ground (negative)
- Green-striped wire = Brake light positive (test with the brake pedal pressed)
- Use a voltage meter to find the correct wires:
Connecting the Diffuser’s Light
- Strip the Wires
- Expose a small section of the green (positive) and black (ground) wires.
- Solder or Twist the Connections
- Connect the diffuser’s red wire to the green-striped wire.
- Connect the diffuser’s black wire to the black ground wire.
- For a more secure connection, solder the wires and use heat shrink tubing.
- Route the Wiring
- Use a fish wire or string to pull the diffuser’s wiring up into the trunk.
- Secure any excess wiring with zip ties to prevent rattling.
- Test the Light
- Before finalizing the installation, press the brake pedal to ensure the diffuser’s LED lights up.
Step 4: Installing the Diffuser
Now that the wiring is complete, it’s time to mount the diffuser.
- Align the Diffuser
- Position the diffuser against the bumper, starting from the center.
- Press firmly to engage the clips.
- Secure the Fasteners
- Reinstall any screws or clips removed earlier.
- Ensure all mounting points are tight to prevent vibrations.
- Reattach Exhaust Tips & Reflectors
- If your diffuser accommodates exhaust tips, reinstall them.
- Clip the reflectors back into place for a clean look.
Step 5: Final Adjustments & Testing
- Lower the Car
- If you used a lift, carefully lower the vehicle.
- Double-Check Wiring
- Ensure the brake light functions correctly when braking.
- Inspect Fitment
- Walk around the car to confirm the diffuser sits flush with the bumper.
Ready to Order
Final Thoughts
The Vicrez vz102490 diffuser is a great way to give your Challenger a more aggressive rear profile while adding functional lighting. The installation is straightforward, especially if you’ve worked with aftermarket rear diffusers before.
Need Help?
If you run into any issues during installation, drop a comment below or check out our full video tutorial for visual guidance.
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🚀 Ready to upgrade? Get yours at Vicrez.com today!
