Skip to product information
1 of 7

MK7 / 7.5 Golf, GTI, R - Wind buffeting diffuser

MK7 / 7.5 Golf, GTI, R - Wind buffeting diffuser


In stock

Regular price $42.00 USD
Regular price Sale price $42.00 USD
Sale Sold out
Shipping calculated at checkout.
Carbon-neutral shipping with Shopify Planet
Carbon-neutral shipping on all orders
Powered by Shopify Planet

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.

This is designed for USDM models. It may not fit international models outside of North America

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). 

Do these really work!? - don't take our word for it, read the reviews on our website, or check out some video reviews:

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.**

Install Info

Install sheets can be found on We are in the process of digitizing all sheets. If you can't find the copy you need, please email us!

Shipping info:

  • Orders placed before 12pm EST typically ship the next business day if the product is in stock. Orders placed after 12pm EST will ship 48 hours later. 
  • Orders placed after 10am EST on Friday will ship on Monday. 
  • Tracking will be emailed as soon as we create the label. 
  • US shipping is free for orders over $75
  • Shipping to Canada is free on orders over $150. (Diffusers, skirts & splitters excluded) 
  • All international shipments are sent DDU and with signature required. You will be responsible for all duties and customs fees and arranging for delivery. 

Shipping & FAQ

  • When will my order ship?
    • Orders placed before 12pm EST typically ship the next business day if the product is in stock. Orders placed after 12pm EST will ship 48 hours later. 
    • Orders placed after 10am EST on Friday will ship on Monday. 
    • DHL Orders placed after 10am EST on Friday will ship on Monday.
    • Tracking will be emailed as soon as we create the label. 
    • Do your products come with a warranty?
      • Yes! We offer a manufacturer warranty on all of our products, the time period ranges by product line, so feel free to contact us for replacement parts. Please be sure to include which pieces you need.
    • Do you ship international? What are the fees?
      • We do ship direct to some countries.
      • The customer is responsible for all import duties and customs fees. They are not built into the product cost. 
    • Is this 3D printed?
      • Yes, All of our pods are 3d printed to allow for continuous improvement. We don't make injection molds because they are far to expensive for the custom fit products we make.

      Still have a question that's not covered here?

      Contact Us



      For part replacements or destroyed products please contact us with the pieces you need! The warranty covers manufacturer defects and failed components for 1 year.

      Cancelled Orders:

      Once the order is placed, any cancelled orders will be charged a 3.5% credit card/Paypal fee that is deducted from the refund. 

      If tracking has already been created, cancelled orders will be charged a 10% restocking fee, based on the order total. The customer is responsible for shipping fees incurred and return shipping fees to send the product back for a refund. 

      We do not provide return labels for orders that ship out of the continental United States. You will have to create your own label to return the product. 

      Our policy lasts 30 days. If 30 days have passed since your purchase, please contact us about the possibility for a refund, store credit or exchange.

      Splitters, chassis brackets, diffusers and side skirts are not returnable or exchangeable.

      To be eligible for a return, your item must be unused and in the same condition that you received it. There are certain situations where only partial refunds are granted.

      25% restocking fee applies to products returned without all original packaging.  We will provide a return label in the first 30 days (since ship date) and deduct the cost of the return label from the refund.

      After 31+ days customer must ship the item themselves. Shipping charges on the original order are not refundable unless it was a CJM shipping error. We do not provide return labels for international shipments.

      For example: $75 part + $6 shipping fee = $81 order total. Customer would like to return because they no longer need it, or ordered the wrong part. 

      $75 (part cost) - $14 (return shipping label) = $61 refund. 


      Refunds (if applicable)

      Splitters, chassis brackets, diffusers and side skirts are not refundable.

      Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
      If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a few days.

      Late or missing refunds (if applicable)
      If you haven’t received a refund yet, first check your bank account again.
      Then contact your credit card company, it may take some time before your refund is officially posted.
      Next contact your bank. There is often some processing time before a refund is posted.
      If you’ve done all of this and you still have not received your refund yet, please contact us at

      Exchanges (if applicable)
      We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at, we will issue a return number and provide a return address.


      Please contact us before returning any merchandise. We will provide a return label in the first 30 days (since ship date). Depending on where you live, the time it may take for your exchanged product to reach you, may vary. We don’t guarantee that we will receive your returned item. We are not responsible packages lost by the carrier.

      View full details

      Customer Reviews

      Based on 12 reviews
      Samuel B.
      They work!

      These work pretty well! With the 2 door the buffeting was pretty bad, these clean it right up!
      Plus they make my gti look like the batmobile

      David H.
      Worked fine at reducing wind

      Worked fine at reducing wind noise, but the adhesive did not hold well at all. Maybe it was too cold out? Currently looking for a suitable adhesive, either some rubber epoxy or CA glue

      Hi David,

      Sorry to hear you had issues. We will be adding some install tips in the box moving forward.

      This VHB tape is rated to hold 50lbs when adhered fully. The cold climate can reduce the tackiness of the tape until it is applied with pressure. If you have a garage, try applying the replacement diffusers after the car is inside overnight. Alternatively, you can run the defrost for 10-15 mins to heat up the windows so they are at least 60* F. That should provide better conditions for the tape to cure properly.

      The part should be pressed and held in place for at least a full minute on each side. Pressure helps the tape adhere more evenly to both surfaces.

      Last, after installing them, do not drive the car for at least an hour to allow the tape to bond. It does not reach full strength until 24hrs after being applied.

      Hopefully this helps.


      Fast shipping and does its job!


      Fast shipping and does its job!

      Subtle and does its job.

      Like the quality of the product. Only issue I had was the plastic in the double sided tape was almost impossible to tear away. Only reason I have it 4 stars