SKU: 85494496369

FI Exhaust Valvetronic Cat-Back System For Audi S4 / S5 (B9) 2018-2024

$1687.50 $1875.00
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Description

FI Exhaust Valvetronic Cat-Back System For Audi S4 / S5 (B9) 2018-2024Audi B9 S4 Fi Exhaust (Frequency Intelligent Exhaust) high performance valvetronic exhaust system is direct replacement bolt on system manufactured out of a high grade T304 stainless steel that offers an exhilarating soundtrack. The Fi EXHAUST system is designed with a valvetronic technology to control airflow, sound volume and enhance the overall performance and torque. On average horsepower is expected to increase from 5 10% after installing a full

Audi B9 S4 Fi Exhaust (Frequency Intelligent Exhaust) high-performance valvetronic exhaust system is direct replacement bolt on system manufactured out of a high-grade T304 stainless steel that offers an exhilarating soundtrack.

The Fi EXHAUST system is designed with a valvetronic technology to control airflow, sound volume and enhance the overall performance and torque. On average horsepower is expected to increase from 5-10% after installing a full catless system, which includes a valvetronic catback and ultra-high flow downpipe.

When valves are closed exhaust gasses are routed through the muffler resulting in a low-profile comfortable drive. However, when the valves are fully open an intense and sporty soundtrack is produced.

Depending on your car model and exhaust setup, switching exhaust valves between street and race modes may be achieved using a factory exhaust/sport button, drive modes, or by selecting the Fi Pro remote control upgrade. Please note that not all options are available for every model. Refer to the available section and contact our representative for confirmation.

The unique sound and performance for Audi B9 S4 is achieved through individually designed muffler internals that are fabricated to offer an ultimate driving experience.

Please note each part of the Fi EXHAUST system needs to be ordered separately.
Different exhaust parts are offered depending on the vehicle version.

Please note that the actual product may vary in appearance depending on the year of the car and area. The exhaust system is also subject to changes to the design over an extended time period. Product pictures are for illustration purposes only.


Catback Exhaust:
Front Pipe + Mid X-Pipe + Valvetronic Muffler + Quad Silver Tips + Standard remote control system module (AD-S4B9-CBV + TIP6389S*4 + R2016OL + OBD-CAB-V)

Downpipes (Optional):
1.Ultra High Flow DownPipe (AD-S4B9-NCAT)
2.Sport 200 cell DownPipe (AD-S4B9-CAT200)

Tips (Optional):
1.Quad Tips in Titanium Blue (TIP6389TB*4)
2.Quad Tips in Diamond Black (TIP6389B*4)
3.Quad Tips in Gold (TIP6389G*4)
4.Quad Tips with Carbon Fiber (TIP6389C*4)

Fi EXHAUST Pro Remote Control System (Optional):
OBD2/Mobile APP Remote Control System Module (R2020OBD)

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 85494496369

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4.3 ★★★★★
Based on 11 reviews
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Verified Purchase
Jerry D. Chapman
Belleville, US
★★★★★ 5
A quality mouse for everyday users
Size: Standard
I was tired of using a mouse with cheap switches. The only choice was to upgrade to a Gaming Mouse with switches made to last. I don't do much gaming except solitaire. The mouse is comfortable to grip. The buttons are easily reached. The size is much better than a compact mouse. The surfaces that you touch have a light grain, not slick like others. It is easy to adjust the mouse speed and know the computer will respond when you press the buttons. The thumb rest is a nice design and adds a little to its footprint to make it glide even easier. The battery cover is magnetic and easy access to the one battery. I needed Bluetooth to not have a wireless dongle stuck in my laptop. It ruined one from hitting my leg. A well made mouse even if you are not a gamer.
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Reviewed in the United States on January 26, 2026
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Verified Purchase
Dave
Alexandria, US
★★★★★ 4
Works good, looks nice. Chews through batteries
Size: Standard
I'm not a huge gamer, but in general it's a pretty nice mouse. The mouse movement is rather fluid and it glides smoothly on my mouse pad. Don't have any issues with connectivity, but I do have the dongle very near the mouse. You can customize how the colors rotate with the Razer program on your desktop. There are several buttons you can customize as well and change how long before it goes to rest mode. I also like that I can accidently bump it and it won't wake my pc from sleep mode (though sometimes I do have to jiggle it around a bit for it to wake my pc up). I love the shape of it alot and the thumb rest, very comfortable in my hand. My only complaint is that I am chewing through batteries like crazy. I feel like I have to replace them about once a month. Will probably invest in rechargeable batteries. But this is a great option for anyone who is looking for a better quality gaming mouse without spending $100+
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Reviewed in the United States on April 4, 2026
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Verified Purchase
VetPilot
Draper, US
★★★★★ 5
High Quality and Operability - Great!
Great mouse! Not only good, but feels and operates as well as, or better than a Microsoft mouse, and a lot more reasonable! Comes with AAA batteries, the USB transceiver is stored inside the battery compartment (good when packing and traveling), and a white support strap lays down below the installed batteries so that it is easier to remove them when its time to change the battery. Be sure to go into Control Panel/Mouse and make any click-speed or mouse movement adjustments to your liking. I plan on buying another one of these for my second HP laptop. The USB transceiver is immediately responsive and you will see a red laser at the bottom of the mouse.
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Reviewed in the United States on April 29, 2026
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Verified Purchase
Yaya
Grantham, US
★★★★★ 5
Works Perfect, No Installation Needed, Perfect Size, and Wonderful Price!
Several months ago when the keys on my laptop mouse pad started to go out, I was really irritated because I have gotten so used to using the mouse pad that I was worried that I wouldn't be able to work as efficiently using a wireless mouse. I knew that it would only be a few days before the keys got to the point that I wouldn't be able to use them and started looking on Amazon for a wireless mouse that I might possibly be able to stand using on a daily basis. I spotted the AmazonBasics Wireless Mouse and thought that it wouldn't be that great because it was way cheaper than most of the other wireless ones that I could find. I went ahead and placed my order because I needed something and thought that if it didn't work that well, I wouldn't be out of that much money. When it arrived, I was happy to see that it was a tad bit smaller than other ones that I have used with desktops in the past since I have small hands. I opened the package, popped in some batteries, plugged the nano receiver into my USB slot, and it was working instantly. I thought that it would take some time to install ( I did not read much on it when I purchased it honestly, I just needed one quick!), but was SO happy to see that it needed nothing to be installed. I have been using this wireless mouse for about a year and half now and I have recommended it to SO many people who were looking for one. I work at home on my laptop 7 days a week and anywhere between 12 - 18 hours a day. I only have to change the batteries about once every two months (sometimes it will go a little longer and sometimes a little bit less - not sure on why though). This mouse has worked flawlessly since the day of purchase and I was SO wrong to think that because it was cheaper than the others that it wouldn't work as well. There has never been a time where it disconnected from the computer or that there was any issue using it. A few times when it has needed the batteries changed and I wait a few days, there is a tiny lag - but that is all my fault. The AmazonBasics Wireless Mouse has a little red indicator light that lets you know when the batteries are getting low and need to be changed. I like that feature so that I'm always aware of when they need to be changed. Since I travel a lot, this mouse is great because it doesn't take up a lot of space in the laptop bag. I also never have to worry about losing the nano receiver because once you remove the little door to the battery area, there is actually a space that the nano receiver clicks into making it perfect for travel. If you are in the market for a great wireless mouse, I would recommend the AmazonBasics Wireless Mouse because it has been through over a year of my all day, everyday use and still works just like the day that I purchased it!
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Reviewed in the United States on September 3, 2015
J
Verified Purchase
Joe Watanabe
Louisville, US
★★★★★ 5
It works and is well priced.
This mouse works as well as much higher-priced brand-name items. It fits well in the hand. The durability is very good. Considering the price compared to other brand names, this is a very good value.
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Reviewed in the United States on May 27, 2026

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