2013-2016 For Audi A4 S4 B8.5 S line diffuser with tailpipe

Product Description

Overview

Transform the rear profile of your 2013–2016 Audi A4 B8.5 S‑Line or S4 with this S4‑style rear diffuser complete with dual tailpipe exhaust tips. Designed specifically for the facelifted B8.5 platform (2013–2016), this diffuser replaces your factory rear valance with the aggressive, sporty look of the S4 — featuring a gloss black UV‑stabilized ABS polymer construction, aggressive honeycomb design, and dual‑outlet exhaust openings that dramatically enhance the visual impact of your rear end.

The B8.5 facelift brought sharper styling and updated bumpers to the A4 lineup. This S4‑inspired rear diffuser builds on that foundation, giving your A4 S‑Line a more commanding presence from every angle while improving rear‑end aerodynamics. The S‑Line bumper is a direct carryover from the S4, allowing A4 S‑Line owners to achieve the same aggressive dual‑exhaust look as the factory S4 without any body‑work modifications. Factory S‑Line and S4 rear diffusers are physically incompatible with standard (non‑S‑Line) bumpers, so this diffuser is specifically designed for vehicles with the S‑Line exterior package.

Critical Fitment Note: This diffuser is exclusively for Audi A4 B8.5 S‑Line (2013–2016) and S4 models. It will NOT fit Non‑S‑Line (standard) A4 bumpers or pre‑facelift B8 (2008–2012) models. The S‑Line/S4 rear bumpers are different from standard A4 bumpers, and the exhaust opening cutouts are not compatible without verification. You must have the factory S‑Line exterior package (or be an S4) for this to fit.

Complete 1‑Stop Conversion Kit: Includes rear diffuser + dual exhaust tips + self‑tapping screws + 3M VHB tape + installation manual.

Aerodynamic Benefits: The sculpted honeycomb design helps smooth airflow, reduce turbulence, and enhance rear‑end stability at higher speeds — a subtle but real performance‑oriented benefit that many owners notice after installation.

Serving both individual enthusiasts (B2C) and businesses (B2B):
✅ US warehouse for fast shipping
✅ CE certified for quality assurance
✅ 1‑year warranty for peace of mind
✅ Factory direct – competitive pricing
✅ Dropshipping & wholesale programs available
✅ Custom OEM/ODM orders welcome

5 Key Features

1. Aggressive S4 Style Design
Give your A4 B8.5 S‑Line or S4 the sharp, sporty look of the S4. The aggressive dual‑outlet design and sculpted lines create a bold, OEM+ appearance that dramatically enhances the rear profile. This diffuser was engineered and designed specifically for the B8.5 S‑Line bumper to add more aggression to the rear of your car while matching the factory appeal of your Audi.

2. Complete Kit with Dual Tailpipe Exhaust Tips
All‑in‑one conversion kit includes the rear diffuser and dual exhaust tips — everything you need for a full S4‑style rear transformation. Features a dual‑tip/dual‑outlet design that fits factory and most aftermarket exhaust systems and is designed to accept exhaust tips up to 4" in diameter. Choose between polished stainless steel or black‑chrome finishes to match your personal style.

3. Premium Gloss Black UV‑Stabilized ABS Construction
Manufactured from high‑quality UV‑stabilized ABS polymer — the same material used in OEM bumpers and body parts. The deep high‑gloss black finish is UV‑protected to prevent fading, yellowing, or bubbling from harsh sunlight. No painting required — ready to install out of the box. A premium pre‑preg dry carbon fiber version is also available for those seeking ultimate weight savings and weave aesthetics.

4. Direct Fitment for B8.5 S‑Line (2013–2016) — No Drilling Required
Engineered for a perfect OEM+ fit onto Audi A4 B8.5 S‑Line and S4 rear bumpers using factory mounting locations. Installs with no drilling, cutting, or modification of any kind required. Simply remove your currently installed valance, line up all tabs, and lightly press the diffuser in place until the tabs click into position.
⚠️ Note: This diffuser is NOT compatible with Non‑S‑Line (standard) A4 bumpers — the S‑Line bumper is a direct hand‑down from the S4, requiring a dual‑exhaust diffuser by default. You must have the factory S‑Line exterior package to install this diffuser.

5. CE & TUV MATERIALGUTACHTEN Certified
This diffuser is CE certified, meeting European safety and quality standards for automotive aftermarket parts. It has also received TUV MATERIALGUTACHTEN certification, verifying material quality and safety for road use. The product also complies with EPR (France/Germany) environmental regulations for packaging and waste management. The product arrives with a protective film — do not remove the protective film until you are certain the product fits, as removal will void the return policy. If you decide to paint the diffuser, primer must be used first.

Specifications