Product Description
CJM Industries Wind Buffeting Diffusers for MK7 Golf, GTI & Golf R
If you found this product, you likely already know what it is for.
This part significantly reduces wind buffeting noise at highway speeds. This wind noise or wind buffeting is also known as Helmholtz resonance.
Wind buffeting is particularly bad on 2 door vehicles, but anyone in a 4 door will also notice the helicopter-like noise in your inner ear when you open just the front windows.
This part is most effective from 0-80mph. Above 80mph the buffeting noise will begin to overcome this parts ability to reduce the resonance. Cross winds can also reduce their effectiveness. These work best when they are diverting air flow from vehicle movement.
IMPORTANT NOTE: As with any aerodynamic part, other parts upstream on the exterior of the car can effect this part’s function. Splitters, endplates, tire spats, hood vents, fender vents can all change airflow feeding into this part. Our testing was done on a car with our V3 aero kit, fender and hood vents. Your results may vary.
Our serrated design is more effective than the small curved profiles you commonly see on Supra's, and Porsche's to combat this noise. Those options do reduce wind noise at some speeds, however they often cause noise at lower speeds. Their effectiveness tapers off above 70mph in most cases (Go read product reviews if you don't believe it).
Made of 3D printed satin black UV resistant ABS composite plastic. Adheres to the front triangle window with included 3M VHB tape. The inside edge is contoured to match the curve of the window, and a pocket recessed into the surface for the VHB tape. The side mirrors can still be folded with this installed.
Why 3d print this? Because it keeps this part affordable for everyone. Most people don't want to spend hundreds of dollars on milled plastic or carbon versions for a part this small.
You can lightly sand and paint this plastic if you prefer gloss black finish.
Each Order Includes:
- 1 Driver Side Reducer
- 1 Passenger side Reducer
- Pre-applied 3M VHB Tape
- Alcohol Swab to clean the window
Want to further reduce wind noise on track at higher speeds? Add some vortex generators to the A-pillar from our friends at Yeti Race Craft. These compliment our diffusers function and will also reduce drag at higher speeds.
**Using this part in conjunction with window wind deflectors will create noise at lower speeds.**
