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Audi A4 (B5) Tuning & Performance Parts

The B5 S4 has always had a bit of a cult following, and the 2.7 biturbo is a big part of why. At Awesome GTI, you’ll find Audi S4 B5 tuning parts for owners who want to refresh the car or take the performance further.

Some owners are chasing more power, while others are focused on tightening up an ageing setup or changing the look. Our S4 B5 range covers both, with parts selected specifically for the model and clear fitment information to help you choose with confidence.

Audi S4 B5 Parts: Bodystyling and Braking

The B5 has a shape that doesn’t need much messing with, so the right exterior parts can make a noticeable difference without changing the character of the car. At Awesome GTI, the Maxton Design Rear Diffuser is available for the Avant, while the Maxton Design Gloss Black Front Splitter adds more definition to the front end.

Brakes are worth paying just as much attention to, especially on an older performance car. We stock options including the EBC Redstuff Front Pads and Tarox Strada Front Brake Pads, giving you different routes depending on how you use the car and what you want from the pedal feel.

If you’re not sure which setup suits your S4 B5, the Awesome GTI team can help you compare the options before you order.

Why S4 B5 Owners Choose Awesome GTI

We've been fitting and upgrading VW, Audi, SEAT and Skoda cars since 1989. The B5 platform is one we still know well after this many years of them coming through the workshop. If you're after Audi S4 tuning beyond bolt-on parts, that's usually a conversation rather than a click. Our APR remap route covers the Audi S4 B5 remap side through a proper consultation. Our own Dynojet 4WD dyno checks the results properly afterwards.

That said, most owners start with the parts they can see. Contact the Awesome GTI team for advice on either route, or browse our Audi S4 B5 performance parts below and get your next job underway.

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  • Performance VW Magazine - December 2025 (AWE-PVW-MAG-DEC25)
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    Performance VW Magazine - December 2025

    Performance VW Magazine - December 2025 Issue Fancy something good to read whilst you're on your break? Love VW's and the culture that comes with modifying them? Look no further! We have in stock the...

    £5.75
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  • Performance VW Magazine - November 2025 (AWE-PVW-MAG-NOV25)
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    Performance VW Magazine - November 2025

    Performance VW Magazine - November 2025 Issue Fancy something good to read whilst you're on your break? Love VW's and the culture that comes with modifying them? Look no further! We have in stock the...

    £5.75
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  • Performance VW Magazine - October 2025 (AWE-PVW-MAG-OCT25) Performance VW Magazine - October 2025 (AWE-PVW-MAG-OCT25)
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    Performance VW Magazine - October 2025

    Performance VW Magazine - October 2025 IssueFancy something good to read whilst you're on your break? Love VW's and the culture that comes with modifying them? Look no further! We have in stock the...

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    APR R1 Diverter Valve for 1.8 20VT Engines
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    APR R1 Diverter Valve for 1.8 20VT Engines

    APR R1 Diverter Valve Diaphragm-Based Valve High-Temperature, Nomex-Reinforced Material for Extreme Durability Zero-Friction No Sticky O-Rings to Maintain and Grease No Pistons to get Stuck...

    £276.79
    RRP £307.54
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  • REVIN Shifter Knob "GRIP" REVIN Shifter Knob "GRIP"

    REVIN Shifter Knob "GRIP"

    Forge your driving experience into an art form. Imagine gear changes as smooth and precise as a dancer's pirouette, but with the aggressive edge of a race car. The Revin Short Shifter isn't just...

    £64.43
  • HALO P1 Brake Fluid - 1.2L
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    HALO P1 Brake Fluid - 1.2L

    The Halo P1 by Orthene brake fluid is the latest in high end brake fluids, suitable for the highest brake temperatures. Halo P1 is formulated to use a very pure form of methyl borate ester, this...

    £139.20
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  • Auto Finesse Avalanche Snow Foam 5-Litre (AUTF-AV5L)
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    Auto Finesse Avalanche Snow Foam 5-Litre

    Powerful, citrus-infused snow foam designed to linger for longer Breaks down, lifts and encapsulates bonded grime and harmful contamination Safe for use on all exterior surfaces including paintwork,...

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    APR A01 Flow Formed Alloy Wheel 19x8.5 ET45 5x112 - Satin Black APR A01 Flow Formed Alloy Wheel 19x8.5 ET45 5x112 - Satin Black
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    APR A01 Flow Formed Alloy Wheel 19x8.5 ET45 5x112 - Satin Black

    SOLD AS A SINGLE WHEEL  APR’s Flow-Formed Wheels are manufactured using the latest strengthening and weight savings techniques to provide an attractive solution ready for the street and track. ...

    £350.73
    RRP £389.70
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Frequently asked questions

How much power can an Audi S4 B5 2.7 V6 Biturbo make with tuning?

There's plenty of potential in the Audi S4 B5 2.7 biturbo V6, but the final figure depends on the software, hardware and condition of the car. A more involved Audi S4 B5 tuning setup can go well beyond standard power, although the car needs to be built around the level you're aiming for rather than chasing a figure on its own.

Is an Audi S4 B5 remap worth it?

An Audi S4 B5 remap can make a noticeable difference to the way the 2.7 biturbo delivers its power without immediately moving into major hardware changes. The condition of the car still matters, though. On an older B5, we'd want to know the engine is healthy before increasing boost or asking more from the standard components.

Which Audi S4 B5 performance parts make the biggest difference?

That depends on what you want from the car. ECU tuning is an obvious option if more power is the goal, while cooling and exhaust upgrades become more relevant as the setup develops. Awesome GTI stocks Audi S4 B5 performance parts for different levels of build, so you can plan the car around how you actually intend to use it.

What should I check before tuning my Audi S4 B5?

Start with the condition of the car. Service history and any previous modifications matter just as much as the Audi S4 B5 parts you're planning to add. Any faults or overdue maintenance should be sorted first. If you're unsure what your B5 needs before tuning, the Awesome GTI team can inspect the car and talk through the next step with you.