Audi RS5 B9 Performance Parts & Tuning Mods

Top Brands For Audi RS5 B9 Upgrades

The Audi RS5 B9 is well supported in the tuning world, with several top brands offering high quality performance parts, styling mods and motorsport upgrades. Below you will find popular names trusted by enthusiasts for serious Audi RS5 B9 builds.

Audi RS5 B9 Exterior Styling Upgrades

To sharpen the look of your Audi RS5 B9, there is a huge range of exterior styling mods and visual upgrades available. From subtle splitters, diffusers and custom grilles to full body kits, spoilers and carbon details, you can dial in a more aggressive, unique road or track presence to suit your taste.

Suspension & Handling Upgrades

For the Audi RS5 B9, the best place to start with cornering upgrades is tyres and brakes. A quality set of performance tyres instantly boosts grip and steering feel, especially in the wet, and makes the quattro system work harder for you. Pair that with uprated brake pads and performance discs for better bite, reduced fade and more confidence when pushing on a fast road or track session. Once the basics are sorted, look at suspension tuning. Lowering springs or a well matched coilover kit will cut down body roll, sharpen turn in and reduce that safe but slightly understeery feel the RS5 can have from the factory. Adjustable dampers let you fine tune comfort versus agility, ideal if it is your daily as well as a weekend toy. To tighten the chassis further, consider uprated anti roll bars, strut braces and fresh performance bushes. These mods add stability and feedback, so the car feels more connected through quick direction changes without becoming harsh. Done in stages, each upgrade brings a noticeable step in control and makes the RS5 B9 more playful and rewarding in the corners, without pretending it is a stripped out race car.

Audi RS5 B9 FAQ

What are the best first performance mods for an Audi RS5 B9?

For most RS5 B9 owners, the best starting point is a quality ECU remap or tuning box, combined with a high flowing panel air filter and improved intake. This unlocks noticeable gains in horsepower and torque without changing the character of the car.

After that, an upgraded cat back exhaust or OPF back system is a popular next step, mainly for sound and a slight performance boost. Paired with a remap and decent fuel, you end up with a sharper, more responsive car that still works perfectly as a daily driver.

How much power can I safely gain from tuning the RS5 B9 2.9 TFSI?

On a stock Audi RS5 B9 with the standard turbos and fuel system, a sensible stage 1 remap typically delivers a healthy bump in power and torque, enough to feel a clear difference in acceleration and mid range pull. The exact figures depend on fuel quality, condition of the car and the tuner’s approach.

With a stage 2 style setup, for example downpipes, freer flowing exhaust and upgraded intake, plus a custom ECU calibration, you can see further gains. The key is to stay within safe limits for turbo speed, exhaust gas temperatures and gearbox torque capability rather than chasing headline numbers.

Do I need supporting mods like intake and exhaust before an RS5 B9 remap?

You do not have to fit hardware upgrades before a stage 1 remap on the RS5 B9, the ECU can be tuned on a completely stock car. Many owners start with software only to keep costs sensible and then add parts later.

If you plan to go further, for example more aggressive tuning or track use, then a performance intake, uprated intercoolers and a less restrictive exhaust system are worthwhile. Whenever you add significant hardware, especially downpipes or turbo upgrades, you should always have the ECU map checked and adjusted to suit.

How does tuning and modifying an Audi RS5 B9 affect reliability?

Mild tuning and bolt on upgrades, when done properly, are generally reliable on the RS5 B9. A conservative ECU remap from a reputable tuner, matched with good quality performance parts and regular servicing, keeps the risk low for a fast road car.

As you push further, for example higher boost, frequent drag runs or track days, the stress on components such as turbos, clutch packs and cooling system increases. In those cases it is important to budget for more frequent maintenance, high quality fluids and proactive checks to keep the car healthy.

What wheel and tyre sizes work well on a tuned RS5 B9?

The factory wheel and tyre setup on the Audi RS5 B9 is already quite aggressive, but many owners go for aftermarket alloys or rims in 20 or 21 inch sizes to sharpen the look and handling. A common upgrade is a wider tyre with a performance road compound to help put the extra torque down.

Sticking close to OEM rolling radius avoids upsetting the speedometer and quattro system. Offsets need to be chosen carefully so you do not foul the arches or suspension arms, especially if you are also fitting lowering springs or coilovers for improved stance and grip.

Will a performance exhaust or decat affect MOT and noise levels on my RS5 B9?

A cat back or OPF back exhaust on the RS5 B9 is usually MOT friendly, as the factory catalytic converters and particulate filters remain in place. You will get a deeper tone and more character without going too wild, ideal for a fast road car.

Fitting decat or sports downpipes can increase power and turbo response, but may affect emissions compliance and noise, especially on cold start. Always check local regulations, and consider a high quality sports cat as a more balanced option for a road driven car.

Do I need a gearbox tune (TCU remap) on a modified RS5 B9?

The stock ZF gearbox calibration on the Audi RS5 B9 copes fairly well with a basic stage 1 engine remap, but a dedicated TCU tune can really improve shift speed, torque management and launch control behaviour. This makes the car feel sharper and more consistent, particularly in dynamic modes.

On higher power setups it becomes more important, as the gearbox needs correct torque limits and pressure settings to handle the extra load. A well matched ECU and TCU package gives smoother part throttle driving and stronger, more confident full throttle shifts.

How much should I budget for a sensible tuning package on an RS5 B9?

As a rough guide, a reputable stage 1 remap on the RS5 B9, with no hardware, usually sits in the mid to high hundreds of pounds. Add a quality intake and cat back exhaust and you may be looking at a few thousand pounds all in, including fitting.

If you want a more complete package, with suspension upgrades, wheels, tyres and possibly intercoolers or downpipes, the total can climb quickly. It is often best to plan a phased build, starting with software and basic bolt ons, then moving to more involved mods once you have lived with each stage and are happy with the results.

Final Thoughts On The Audi RS5 B9

The RS5 B9 is a seriously capable bit of kit straight out of the box, with a punchy twin turbo V6, quattro grip and a cabin that makes daily driving feel special. What it sometimes lacks is a bit of raw edge, the standard car is quick but quite reserved in sound and character. That is exactly where sensible tuning and a few well chosen performance parts can wake it up without ruining what makes it such a good all rounder. With a proper remap, breathing upgrades and improved cooling, the RS5 B9 responds well with stronger mid range punch and sharper throttle feel, all while staying usable every day. Suspension mods, quality coilovers or springs and upgraded anti roll bars, help dial out some of the safe factory understeer and body roll, so the car feels more adjustable rather than just point and shoot. Match that with lightweight alloys and sticky tyres and you get better turn in and confidence without needing wild power figures. The weaker points of the stock car are well known among enthusiasts, the standard brakes can fade if you push hard on track, and the factory suspension is more comfort biased than hardcore. We regularly see RS5 B9 builds where a big brake kit or uprated pads and discs, plus fluid, transform stopping power, and a more focused alignment setup really sharpens the chassis. For higher power, it is also worth looking at gearbox software and cooling to keep the strong ZF8 transmission happy over the long term, especially if you enjoy spirited drives. Put simply, with the right balance of power mods, handling upgrades and subtle styling touches, the RS5 B9 can move from “very fast GT” to a genuinely exciting performance car that still does the school run and motorway slog with ease. We have seen many different RS5 B9 projects, from understated OEM+ builds to more aggressive track focused cars, and the common theme is that the platform responds nicely to thoughtful upgrades. If you take a measured approach, focusing on reliability and drivability as well as speed, you end up with a car that feels tailored to you, more rewarding every time you get behind the wheel and still every bit the classy, capable RS that tempted you in the first place.