Audi S5 B9 Performance Parts & Tuning Mods

Top Brands For Audi S5 B9 Upgrades

The Audi S5 B9 is well supported in the tuning world, with several top brands offering performance parts, styling upgrades and track-focused mods. Below you will find popular manufacturers trusted for quality, reliability and proper enthusiast-grade gains.

Exterior Styling Upgrades

Give your Audi S5 B9 a sharper, more aggressive look with a range of exterior styling upgrades, from body kits, front splitters and rear diffusers to spoilers, side skirts and custom grilles. These visual mods let you dial in a unique style, whether you prefer subtle tweaks or full-on motorsport vibes.

Audi S5 B9 Suspension & Handling Upgrades

The Audi S5 B9 is a quick and capable GT from the factory, but it can feel a bit soft and understeery when pushed hard, especially on fast road or track. The first step for sharper cornering and stability is always good rubber, so a set of quality performance tyres instantly improves grip, feedback and braking confidence. Pair that with uprated brake pads, braided lines and high temperature fluid and you get stronger, more consistent stopping power that lets you brake later without the pedal going spongy. Once tyres and brakes are sorted, proper suspension tuning really wakes the car up. Lowering springs or a well matched set of coilovers reduce body roll and tighten up the S5 B9’s stance, giving you a more direct, agile feel without ruining everyday comfort if you choose sensibly. Add stiffer anti roll bars and fresh performance bushes to tame that factory understeer and keep the chassis flatter through quick direction changes. A front strut brace can further sharpen steering response, making the car feel more connected and confidence inspiring when you lean on it in the bends.

Audi S5 B9 FAQ

What are the best first performance mods for an Audi S5 B9?

For the Audi S5 B9, the usual first upgrades are an ECU remap, a high quality panel filter or intake kit, and a decent cat back exhaust. These mods wake the car up nicely, giving sharper throttle response and stronger mid range torque without going too wild.

If you want to keep things simple, start with a stage 1 remap on an otherwise stock car. You can then add an intake and exhaust system later, which will let the turbo breathe more freely and support further tuning if you decide to go to a higher stage.

How much power can I gain from remapping my Audi S5 B9?

The 3.0 TFSI turbo engine in the S5 B9 responds very well to a proper ECU remap. A stage 1 tune on a healthy engine, running good fuel, will usually give a noticeable bump in horsepower and torque, particularly through the mid range where you use it most on the road.

If you add supporting performance parts, such as a higher flow intake, upgraded intercooler and a freer flowing downpipe or exhaust, you can move to a stage 2 style setup. This usually brings further gains, but it is important to use a reputable tuner who understands these engines and can keep everything within safe limits.

Will tuning my Audi S5 B9 affect reliability?

Light to moderate tuning on the S5 B9, such as a sensible stage 1 remap and bolt on upgrades, is generally reliable if the car is well maintained. Regular oil changes, good quality fuel and keeping on top of service items are essential once you start adding extra power.

More aggressive setups, higher boost or track use will increase stress on components such as the turbo, clutch or gearbox. If you plan to push the Audi S5 B9 hard, budget for preventative maintenance and possible supporting mods like improved cooling, upgraded plugs and more frequent fluid changes to keep reliability on your side.

Do I need supporting mods for a stage 1 tune on my Audi S5 B9?

For most stage 1 remaps on the S5 B9, you can usually run the tune on a completely stock car, provided everything is in good condition. The factory intake, intercooler and exhaust are capable of handling a modest increase in boost and torque.

That said, an uprated panel filter or intake, and fresh spark plugs gapped correctly, are cheap insurance and can help the engine run more consistently. If you are planning track days or hard use, consider an upgraded intercooler and improved cooling at the same time as your tune for added safety and stability.

What exhaust upgrades work best on the Audi S5 B9?

A cat back exhaust system is usually the best starting point for the Audi S5 B9. It improves sound, sheds some weight and can help the turbo spool more freely, especially when combined with an intake and remap. Many systems also offer valved options, so you can keep things civil in comfort mode and louder in dynamic.

For bigger performance gains, a high flow downpipe or sport cat can reduce back pressure further. This type of exhaust mod will almost always require an ECU remap to avoid warning lights and to make the most of the hardware, and you should check local emissions and MOT regulations before going for more aggressive setups.

What wheel and tyre sizes fit well on a tuned Audi S5 B9?

The S5 B9 looks and drives well on 19 or 20 inch wheels, with a range of OEM and aftermarket alloys and rims available. Many owners run 19x8.5 or 19x9 setups with sensible offsets, paired with performance tyres for improved grip and steering feel.

If you go wider or lower the car on coilovers or springs, you will need to pay attention to offsets and tyre profiles to avoid rubbing. A good rule is to choose quality lightweight wheels, avoid extreme stretch, and focus on a balanced combination of looks, handling and ride comfort rather than just filling the arches.

How much should I budget for tuning an Audi S5 B9?

Costs vary depending on how far you want to go. As a rough guide, a basic stage 1 ECU remap is usually the most cost effective power upgrade, with intake and exhaust mods adding to the total. You can often achieve a very strong fast road setup with a remap, intake, cat back exhaust and upgraded pads and tyres without going overboard.

If you aim for a more serious build, for example stage 2 with intercooler, sport cat or downpipe, suspension upgrades and possibly transmission software, the budget will climb accordingly. It is always wise to allow extra for servicing, fluids and any wear items that show up once you start using the extra performance more often.

Final Thoughts On The Audi S5 B9

The S5 B9 is already a very complete package from the factory, with a strong 3.0 TFSI turbo V6, surefooted quattro grip and a cabin that feels special even on a daily slog. Its character is refined and effortless rather than wild, which is exactly why it responds so nicely to carefully chosen mods. With the right performance parts you can sharpen that relaxed personality into something a bit more serious without ruining day to day usability. We have seen plenty of S5 B9 builds where a quality remap, uprated intake and freer flowing exhaust unlock noticeably stronger mid range punch and a more involving sound. Supporting hardware like uprated intercoolers and better charge pipe solutions help keep intake temps in check, especially on tuned cars that get driven hard. The stock brakes and suspension are fine for road use, but once you start pushing on fast B roads or doing the odd track day, uprated pads, lines, coilovers or sport springs make the car feel far more composed and confidence inspiring. There are a few known limitations that are worth addressing as you tune. The factory suspension can feel a bit soft and floaty when you add power, and the standard exhaust is very muted for an S model, so handling and styling upgrades are popular early on. The ZF gearbox is robust, but torque management and calibration really benefit from proper transmission tuning when you go beyond mild power gains, keeping shifts clean and protecting the hardware. Cooling and airflow upgrades also pay off in consistency, rather than chasing headline dyno numbers. Put together correctly, an upgraded S5 B9 becomes a properly rewarding all round fast car, still comfortable and refined yet much sharper when you want to have fun. We have seen many S5 B9 owners transform their cars with sensible, well matched mods that suit their driving, from subtle daily driven upgrades to more focused track capable builds. The key is balancing power, chassis and reliability, choosing quality performance parts that complement what Audi built in the first place. Treated that way, the S5 B9 is a fantastic platform for tuning and you can shape it into exactly the sort of coupe or sportback you want, whether that is a discreet sleeper, a stylish cruiser or a genuinely quick road and track toy.