What vehicles does the Fi Exhaust B9 S4 system fit?

The Fi Exhaust B9 S4 system fits the B9 Audi S4 and S5, 2017-present, with the 3.0L turbocharged V6, on vehicles without the sport differential.

Does this fit cars with the sport differential?

No. This system is for non-sport-differential vehicles only; confirm your equipment before ordering.

What is the exhaust made from?

High-grade T304 stainless steel, with a front pipe, mid X-pipe, valvetronic muffler, quad tips, and standard remote as the base system.

Can I control the valves remotely?

Yes. Valve operation integrates with the car's OEM controls by default, or can be upgraded to the Fi Pro App Remote for an additional $380.

Are downpipes available, and will they increase horsepower?

Yes. Race Downpipes (additional $1,450) and Sport Downpipes (additional $1,800) are both available as separate options. Fi Exhaust reports an average horsepower increase of 5-10% when running the full system with a downpipe.

How much does this exhaust cost?

The base system is $3,750, before downpipe, tip finish, or remote options.

Description

Additional Info

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BP PRICING DIFFERENCE

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Description

Fi Exhaust Valvetronic Exhaust System for B9 Audi S4 & S5

Fi Exhaust B9 S4 system is a direct bolt-on valvetronic exhaust for the B9 Audi S4 and S5 without the sport differential and their 3.0L turbocharged V6, constructed from high-grade T304 stainless steel. Engineered with valvetronic technology, it optimizes airflow, adjusts sound volume, and improves overall performance and torque. Installing a full system, including a valvetronic catback and an ultra-high-flow downpipe, can increase horsepower by 5-10%. With the valves closed, exhaust gases are routed through the muffler for a refined and comfortable drive; when fully open, the system delivers an intense and sporty soundtrack.

Valve

Fi Exhaust systems universally incorporate valvetronic technology, enabling precise sound control while boosting vehicle performance. Prior to this innovation, achieving both high torque at low RPMs and greater horsepower at high RPMs was challenging. Valvetronic technology resolves this contradiction, allowing sports cars to excel in both areas and delivering a balanced yet dynamic exhaust performance.

Fi Exhaust Pro Control System

The Fi Exhaust Pro Control System includes an intelligent control box, a two-button remote, and a mobile app. The app prevents check engine lights, monitors valve status, and enables Auto Mode based on RPM, speed, or boost. The remote allows precise valve control, with a customizable aluminum or forged carbon design.

Features

Valvetronic technology for precise sound control
High-grade T304 stainless steel construction throughout
Increases horsepower by 5-10% when run with the complete system
Quad tip configuration
Integrates with OEM controls, or available with the optional Fi Pro App Remote
Race and Sport downpipes available as separate options
Exhaust tips available in four finishes: carbon fiber, diamond black, gold, titanium blue

What’s Included

Front pipe
Mid X-pipe
Valvetronic muffler
Quad tips
Standard remote

Applications

Audi S4: B9 | 2017-present | 3.0L Turbo V6
Audi S5: B9 | 2017-present | 3.0L Turbo V6

Notes

Compatible with vehicles without the sport differential only

Frequently Asked Questions

What vehicles does the Fi Exhaust B9 S4 system fit? The Fi Exhaust B9 S4 system fits the B9 Audi S4 and S5, 2017-present, with the 3.0L turbocharged V6, on vehicles without the sport differential.
Does this fit cars with the sport differential? No. This system is for non-sport-differential vehicles only; confirm your equipment before ordering.
What is the exhaust made from? High-grade T304 stainless steel, with a front pipe, mid X-pipe, valvetronic muffler, quad tips, and standard remote as the base system.
Can I control the valves remotely? Yes. Valve operation integrates with the car’s OEM controls by default, or can be upgraded to the Fi Pro App Remote for an additional $380.
Are downpipes available, and will they increase horsepower? Yes. Race Downpipes (additional $1,450) and Sport Downpipes (additional $1,800) are both available as separate options. Fi Exhaust reports an average horsepower increase of 5-10% when running the full system with a downpipe.
How much does this exhaust cost? The base system is $3,750, before downpipe, tip finish, or remote options.

About Fi Exhaust

Fi Exhaust is a premier aftermarket automotive exhaust brand specializing in high-performance systems for supercars, sports cars, and luxury vehicles. Serving renowned marques such as Lamborghini, Ferrari, McLaren, Porsche, Mercedes-AMG, BMW M, Audi, and Nissan, Fi Exhaust is dedicated to delivering superior sound and performance. The brand’s research and development team consistently engineers exhaust systems designed to perform flawlessly under all conditions, catering to enthusiasts who demand both exceptional sound and optimized performance. Each exhaust system is meticulously crafted to produce a distinctive tone, ranging from deep bass to an exotic, high-pitched, motorsport-inspired sound tailored to each vehicle model. Every system undergoes extensive testing and precise sound tuning to achieve peak performance and integrate seamlessly with the intelligent control system.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Fi EXHAUST Valvetronic Exhaust System for B9 Audi S4 & S5

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Fi Exhaust Valvetronic Exhaust System for B9 Audi S4 & S5

Valve

Fi Exhaust Pro Control System

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About Fi Exhaust

Reviews