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Exhaust› Exhaust Pipes, Systems and Components

Fi Exhaust

Valvetronic Cat-Back System

$3,750.00 $3,749.99 Save $0.01

SKU: AD-S4B9-CBV

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 Fi Exhaust Valvetronic Cat-Back System is a direct replacement bolt-on exhaust manufactured from high-grade T304 stainless steel for the Audi S4/S5 (B9) 2018-2024 models with the 3.0TFSI engine.
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The Fi Exhaust Valvetronic Cat-Back System is a direct bolt-on performance exhaust designed for the Audi S4/S5 (B9) models equipped with the 3.0TFSI engine, covering years 2018-2024. Constructed from high-grade T304 stainless steel, this system aims to provide an exhilarating soundtrack while improving the vehicle's auditory experience. Featuring advanced valvetronic technology, the Fi Exhaust system allows for precise control over airflow and sound volume. When the valves are closed, exhaust gases are routed through the muffler, ensuring a comfortable and low-profile drive. Conversely, opening the valves fully produces an intense and sporty soundtrack. This technology is engineered to enhance overall performance and torque, with an average horsepower increase of 5-10% expected when paired with a full catless system including an ultra-high flow downpipe. The system offers integration with the car's existing controls, such as the factory exhaust/sport button or drive modes, for managing valve operation between street and race settings. An optional Fi Pro remote control upgrade with Bluetooth OBD/Mobile app functionality is also available for more advanced control. It is important to note that not all control options are available for every model, and users should confirm compatibility. The unique sound and performance characteristics are achieved through individually designed muffler internals, fabricated to deliver an ultimate driving experience.

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

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandFi Exhaust
Part NumberAD-S4B9-CBV
CategoryExhaust

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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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