Exterior Components› Body Panels and Components

Canadian Auto Performance

V1 Rear Diffuser

$549.99

SKU: CAP-D-014

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Canadian Auto Performance carbon fiber rear diffuser is a V1 model designed to enhance the sporty look of your Audi. It is specifically designed for the B8.5 Audi A4 S-Line and S4 models.
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This diffuser enhances the vehicle's sporty appearance while maintaining an elegant profile, giving it a more aggressive rear-end look that complements upgraded rear bumpers. This diffuser integrates an LED brake light, with specific wiring instructions provided: Red for the live wire, Black for the ground wire, and Yellow for the brake light wire. Installation requires the removal of the rear bumper and should be performed by a professional with aftermarket product experience to ensure proper fitment. This specific diffuser is compatible exclusively with the B8.5 Audi A4 S-Line and S4 models. It is explicitly stated that this product does not fit the B8.5 Audi A4 non-S-Line variants.

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

BrandCanadian Auto Performance
Part NumberCAP-D-014
CategoryExterior Components

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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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