MMD Rear Diffuser Fins User Manual

1. Introduction

The MMD Rear Diffuser Fins are designed to enhance the rear aesthetic of specific 2015-2017 Ford Mustang models. These fins provide an aggressive, race-inspired appearance and are manufactured from durable, injection-molded ABS material for superior durability and impact resistance. This manual outlines the necessary steps for proper installation and provides important product information.

Product Name: MMD Rear Diffuser Fins
Brand: MMD
Model Number: 394110

2. Compatibility

These MMD Rear Diffuser Fins are specifically designed for 2015-2017 V6, EcoBoost, and GT Mustangs equipped with the factory Base (Non-Premium) Chassis Packages only. This includes Trim Levels: 050A, 051A, 100A, and 300A. They are not intended for use on Premium Package models.

It is crucial to verify your Mustang's rear bumper style before installation. Refer to the comparison image below to determine if your vehicle has a Premium or Non-Premium bumper.

Image 2.1: Comparison illustrating the difference between Premium and Non-Premium Mustang rear bumpers. Premium bumpers typically feature textured black trim with a body-colored diffuser, while Non-Premium bumpers are entirely body-colored.

3. Setup and Installation

The MMD Rear Diffuser Fins feature a simple peel-and-stick installation process using pre-applied 3M double-sided automotive bonding tape. No drilling or messy glues are required.

Required Tools:

• Clean microfiber cloth
• Rubbing alcohol or automotive-grade surface cleaner

Installation Steps:

1. Prepare the Surface: Thoroughly clean the area on your Mustang's rear bumper where the diffuser fins will be installed. Use rubbing alcohol or an automotive-grade surface cleaner to remove any dirt, wax, grease, or debris. Ensure the surface is completely dry before proceeding.
2. Test Fit: Before removing the adhesive backing, carefully position each diffuser fin on the bumper to determine its exact placement. Use the included push pins as a guide for alignment. This step helps ensure a perfect fit and avoids misplacement.
3. Apply Adhesive: Once satisfied with the placement, peel the red protective film from the 3M double-sided automotive bonding tape on the back of the diffuser fin.
4. Secure the Fin: Carefully align the fin with the pre-determined position and firmly press it into place. Apply consistent pressure across the entire surface of the fin for at least 30 seconds to ensure proper adhesion of the 3M tape.
5. Repeat for Remaining Fins: Repeat steps 1-4 for all remaining diffuser fins.
6. Curing Time: Allow the adhesive to cure for at least 24-48 hours before exposing the vehicle to high speeds, car washes, or extreme weather conditions. This ensures maximum bonding strength.

Image 3.1: A single MMD Rear Diffuser Fin, illustrating the pre-applied 3M double-sided automotive bonding tape on its underside, ready for installation.

Image 3.2: Rear view of a silver Ford Mustang, showcasing the MMD Rear Diffuser Fins installed on the lower bumper, providing an aggressive aesthetic.

4. Care and Maintenance

The MMD Rear Diffuser Fins are made from durable ABS material designed to withstand daily driving conditions. To maintain their appearance:

• Regularly clean the fins with mild automotive soap and water.
• Avoid using abrasive cleaners or harsh chemicals that could damage the matte black finish.
• For best results, hand wash and dry the fins with a soft cloth.

5. Troubleshooting

If you encounter any issues with your MMD Rear Diffuser Fins, consider the following:

Adhesion Issues:

• Poor Surface Preparation: Ensure the bumper surface was thoroughly cleaned and free of wax, grease, or dirt before installation. Residue can prevent proper adhesion.
• Insufficient Pressure: Make sure adequate and consistent pressure was applied during installation to activate the 3M adhesive.
• Temperature: 3M adhesive performs best when applied in moderate temperatures (typically above 60°F / 15°C). If installed in cold conditions, the adhesive may not bond effectively.
• Curing Time: Ensure the recommended curing time (24-48 hours) was observed before exposing the vehicle to stress.

Fitment Issues:

• Incorrect Bumper Type: Verify that your Mustang has a Non-Premium rear bumper. These fins are not compatible with Premium Package models. Refer to the compatibility section and image.

6. Specifications

7. Warranty and Support

Specific warranty information for the MMD Rear Diffuser Fins is not provided within this manual. For details regarding warranty coverage, returns, or technical support, please contact the manufacturer, MMD, or the retailer from whom the product was purchased. Keep your proof of purchase for any warranty claims.