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Exterior Components› Running Boards, Truck Steps and Components

Maxton Design

Side Skirts Diffusers

Name: Side Skirts Diffusers
Brand: Maxton Design
SKU: AU-A4-B9-AV-SD1G

$639.00 $296.81 Save $342.19

SKU: AU-A4-B9-AV-SD1G

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$100 Minimum Order

Non-Returnable Item

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Easy — 1–2 hours

Overview

The Maxton Design side skirts diffusers are designed to enhance the visual appeal and improve the aerodynamics of your Audi S4 or A4 S-Line B9.

Crafted from ABS plastic, a material commonly used in OEM parts, these diffusers offer impact resistance, scratch resistance, and shock absorbency. They are treated with UV protection coating and come TUV certified for material quality.

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The Maxton Design side skirts diffusers are engineered to provide both a visual upgrade and aerodynamic benefits for your Audi S4 or A4 S-Line B9, increasing downforce. The material is the same used in many OEM automotive parts. Each product is treated with a UV protection coating and is TUV certified for material quality. These side skirts are available in three distinct finishes: Gloss Black, Textured Black, and Carbon Look. The product is ready for installation and typically requires no additional preparation, though the textured version may need painting. Maxton Design recommends installation by professional auto body shops experienced with visual modifications. Installation is designed to be straightforward due to precise fitment, achieved through 3D laser scanning of the vehicle model. Mounting manuals and kits are included with the product. This specific model is designed for the Audi S4 B9 (2017-2019) with the 3.0T engine.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Maxton Design
Part Number	AU-A4-B9-AV-SD1G
Category	Exterior Components

Videos

Maxton Design Side Skirt Install | Audi S5 Sportback B9

Maxton Design side splitters install - Audi S4 & A4 (S-Line) 2019 B9

How to install SIDE SKIRTS ABS Gloss Black | #StreetPlus

Audi B9 Q5/SQ5 - Maxton Design Side Skirt Install - WATCH FIRST!

Fitting a styling kit to an Audi RS4! | Maxton Design UK

How to install a Maxton Design front spoiler! *DOS and DON'TS*

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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