Caleb's B9 S4
In 2023, I began searching for a new high-performance, track-capable vehicle to replace my MK6 GLI, which had since been converted into an autocross toy. I found this low-mileage 2018 B9 S4 Prestige with almost every available option at an unbelievable price, and it checked all the boxes for me.
I've always felt that the aggressive styling of the B9 generation doesn't need much to stand out. However, the goal for this build was a stealthy, OEM+ look. To achieve that, I replaced the Audi rings, S4 emblems, fender badges, lower bumper grilles, window trim, bumper reflectors, and mirror caps with gloss black versions. The front grille was then swapped for an RS-style gloss black piece, and our black front lip and rear diffuser completed the look. For wheels, I partnered with Rohana Wheels to spec out a perfectly suited set of RFX13s in gloss black.
Under the hood, the car boasts a full lineup of ECS performance upgrades: intake system, turbo inlet and outlet, intercooler, charge pipes, post-throttle pipes, catch can, diverter valve spacer, and more. It's lowered on our ECS lowering springs, which pair beautifully with the OEM adaptive suspension. The car is tuned by our friends at Integrated Engineering, running their Stage 2 ECU and TCU tunes, making the car absolutely RIP while maintaining all factory safety protocols.
It sounds just as good as it drives, thanks to a higher-flowing cat, Supersprint downpipes, and an ECS X-pipe, all while retaining the factory valved mufflers.
This car has been used in the development of several new products here in R&D, with more exciting upgrades to come.
Caleb's IG - ProjectSinisterS4
Audi B9 S4 3.0T Build List
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Ships on Sep 23, 2026
Perform tune in minutes from the comfort of your own driveway! Only available for purchase in the United States and Canada.
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