KDM Accessories
Audi A4 S-Line and S4 Diffuser with Rear Canards
Audi A4 S-Line and S4 Diffuser with Rear Canards
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Fits:
Audi A4 S-Line 2017–2018 B9
Audi S4 2017–2018 B9
NOTE:
Will NOT fit 2016 or older models, 2019+ facelift models, or non-B9 Audi A4/S4 versions. Message us to confirm fitment.
Upgrade the rear end of your Audi A4 or S4 with this Rear Diffuser, designed specifically for the 2017–2018 B9 model. This diffuser adds a more aggressive, performance-inspired look while keeping a clean OEM+ fit.
Perfect for anyone looking to enhance the rear bumper without doing a full body kit.
✅ Key Features
Precision fit for 2017–2018 B9 Audi A4 S-Line & S4 rear bumper
Aggressive sporty design with defined fins
Available in Gloss Black or Carbon Fiber Style
Made from high-quality ABS plastic — lightweight & durable
Enhances rear-end styling & sporty appearance
OEM-style fitment — blends seamlessly with factory bumper
Designed to complement the factory dual or quad exhaust setup
🔧 Installation
Simple bolt-on / clip-on design
Uses existing mounting points + screws for side spat
No major modifications required
Install can be done at home in under 60 minutes
👉 Installation instructions available
📦 What’s Included
1× Rear Diffuser — selected finish
2x Side Spat Extension
Mounting hardware — Screws & 3M Tape
Free KDM Accessories Goodies & Gifts
⭐ Why Audi Owners Love It
This is one of the easiest exterior mods you can do that actually changes the whole rear look of the car. It adds depth, makes the bumper look lower, and gives that clean aggressive finish without overdoing it.
Let customers speak for us
It matches my blacked out Kia stinger perfectly. It shines so good. And it’s really well-made. Very durable.
Sturdy and quality keychain. My friend loved it. The detail is clear and really good and it’s got good weight to it. Customer service from the seller was also amazing. I had a few questions and answered them all and was also very accommodating. Quick responses and quick shipping.
Very cute keychain! I purchased it as a Christmas gift for my son. He purchased his first new car this summer - a Kia Sportage - so it was a perfect way to celebrate this exciting event for him. He loved the gift! I definitely recommend this product.
They got my order shipped out same day and it delivered with no problems. High quality and so excited to give it to my buddy with a matching car.
Bought this as a gift, recipient absolutely loved it! Very good quality product and exactly as described.
Incredible Seller!!! Great Price, Lightning Fast Delivery, & Awesome Customer Service
ROLL TIDE 🐘🐘🐘🐘🐘
HOOK EM🐂🐂🐂🐂🐂
These plate covers came SO quick and he even included some little KDM decal stickers, I will be a returning customer!!☺️
10/10
Shipped really quickly and it fits amazing👏🏼purchased from him a couple time and I'm never disappointed
KDM was awesome I accidentally shipped to my second house they were quick about changing the address for me.
The spoiler fits perfectly only suck part is removing the factory one took a bit too longer than I’d liked
This Side Skirt is pairs really well with their Front Lip as well as their Rear Diffuser. I unfortunately ended up scraping my right side skirt as I was too close to a curb while turning but it held up really well! With a simple polish and some gloss black paint I was able to hide the damage pretty well. Needless to say, this thing can take a pretty good beating and still be fine.
Alone it looks fine especially on Black K5's, however paired with their Duckbill spoiler it is a match made in heaven. This is the closest thing to Louvers for my K5.
