Integrated Engineering continues to expand its performance catalog for modern Audi platforms, and Extreme Power House has added four new iE upgrades covering both the latest-generation B10 S5 and the established B9/B9.5 S4.

For the 2025+ Audi B10 S5, the new additions focus heavily on chassis performance:

• Integrated Engineering Front Sway Bar Upgrade
• Integrated Engineering Rear Sway Bar Upgrade
• Integrated Engineering Performance Lowering Springs

Together, these components give B10 S5 owners several ways to sharpen steering response, reduce body movement, improve cornering balance, and create a lower, more aggressive stance.

For Audi B9 and B9.5 S4 3.0T owners, the fourth addition takes a different approach: the Integrated Engineering Valved Cat-Back Exhaust System, featuring smartphone-based valve control for drivers who want more exhaust character without committing to maximum volume all the time.

A New Chassis Upgrade Path for the Audi B10 S5

The new B10 S5 brings Audi's performance sedan into a new generation, and suspension tuning becomes particularly important as enthusiasts begin modifying the platform.

Rather than adapting components developed around the previous B9 chassis, Integrated Engineering has developed its new suspension upgrades specifically for the B10 S5.

That matters because the latest platform has its own weight, suspension characteristics, and chassis behavior.

The new iE front and rear sway bars are designed around those characteristics, while the lowering springs are engineered to work with the B10 S5's factory dampers.

This gives owners the ability to upgrade the chassis progressively.

Start with a sway bar.

Add both front and rear bars.

Lower the car with matched springs.

Or combine the components into a more complete street-performance suspension setup.

Integrated Engineering Front Sway Bar for Audi B10 S5

The Integrated Engineering Front Sway Bar Upgrade is designed for drivers who want the B10 S5 to respond more immediately to steering input and feel more controlled through corners.

According to iE's product description, the front bar is specifically developed around the B10 platform and its increased vehicle weight compared with the outgoing B9 generation. It uses two adjustable stiffness settings, with both configurations stiffer than the factory setup.

Sharper Turn-In and More Front-End Control

A sway bar influences how much the body rolls as the vehicle corners.

Increasing roll stiffness can help reduce excessive body movement and make the chassis feel more immediate during directional changes.

For the B10 S5, iE specifically targets sharper steering response, improved chassis control, and reduced understeer tendencies.

That makes the front sway bar especially appealing for drivers who feel that the factory car could use a more direct front-end response on winding roads.

Instead of replacing the complete suspension system, the sway bar targets one specific aspect of chassis behavior.

Two Adjustable Stiffness Settings

The front bar provides two performance-oriented stiffness settings.

That allows owners to choose how aggressively they want the front roll stiffness configured.

A driver primarily using the car as a daily may prefer one setting.

Someone placing greater emphasis on spirited driving may prefer the firmer alternative.

Importantly, both positions are designed to offer increased stiffness over the original setup rather than providing one performance setting and one factory-equivalent position.

Steel Construction and Billet Connectors

Integrated Engineering manufactures the front sway bar from steel and uses precision-machined billet connectors.

The bar also receives iE's recognizable green powder-coated finish.

Beyond adding some color beneath the vehicle, the coating contributes to the performance-oriented appearance associated with iE suspension components.

Direct B10 S5 Fitment

The bar is designed specifically for the 2025+ Audi B10 S5 and uses a vehicle-specific bolt-in layout rather than a universal suspension design.

This makes it a targeted upgrade for the new chassis and helps simplify installation when fitted to the correct vehicle.

Shop the Integrated Engineering Front Sway Bar Upgrade:
https://x-ph.com/integrated-engineering-front-sway-bar-upgrade-for-audi-b10-s5-iessdf2/

Integrated Engineering Rear Sway Bar for Audi B10 S5

The matching Integrated Engineering Rear Sway Bar Upgrade approaches chassis tuning from the opposite end of the car.

While the front bar helps sharpen turn-in and control front roll behavior, the rear bar can be used to influence vehicle rotation and overall cornering balance.

iE designed the rear bar specifically for the B10 platform, again accounting for the vehicle's characteristics rather than simply repurposing a previous-generation component. It also provides two adjustable stiffness settings and is intended to work particularly well when paired with the matching front bar.

Reduce Rear Body Movement

Increasing rear roll stiffness helps reduce excessive body movement during cornering and quick directional changes.

That can make the rear of the vehicle feel more controlled and responsive.

For a performance sedan, the objective isn't simply to make the suspension stiffer.

The goal is to make the chassis behave more predictably as lateral load builds.

Encourage More Neutral Handling

Audi's all-wheel-drive performance cars are designed with stability in mind, but enthusiast drivers often look for a more neutral balance when modifying the chassis.

The iE rear bar is designed to help manage rear roll stiffness and contribute to more predictable vehicle rotation.

When paired correctly with the front sway bar, the two components can work together to refine the balance between the front and rear axles rather than modifying one end of the vehicle in isolation.

Two Rear Stiffness Settings

Like the front upgrade, the rear bar features two adjustable settings.

Both are stiffer than the factory configuration.

That gives owners an opportunity to adjust rear roll behavior according to their preferences and the rest of the suspension setup.

The ability to tune both front and rear bars becomes especially useful when the two iE components are installed together.

Better Weight-Transfer Management

Cornering forces transfer vehicle weight from one side to the other.

The sway bars help control how the suspension responds to that lateral load.

By increasing rear roll stiffness, the iE bar is designed to contribute to more controlled weight transfer during cornering and quick transitions.

For drivers who enjoy technical back roads, this can help make the car feel more composed when changing direction.

Pair Front and Rear for a More Complete Setup

The front and rear sway bars can each be installed independently, but Integrated Engineering specifically recommends considering them together for a more cohesive handling upgrade.

The combination allows front and rear roll stiffness to be addressed as one package.

That can help improve:

• Steering response
• Cornering balance
• Body-roll control
• Vehicle rotation
• Weight-transfer management
• Overall chassis response

For someone building a handling-focused B10 S5, the sway-bar pair is a logical foundation.

Shop the Integrated Engineering Rear Sway Bar Upgrade:
https://x-ph.com/integrated-engineering-rear-sway-bar-upgrade-for-audi-b10-s5-iessdf3/

Integrated Engineering Performance Lowering Springs for Audi B10 S5

Not every driver wants to move straight into a complete coilover system.

For owners who want a lower stance and sharper suspension response while retaining the factory dampers, the Integrated Engineering Performance Lowering Springs offer another route.

iE developed these springs specifically around the B10 S5's suspension characteristics and factory damping system.

The goal is to lower the vehicle, reduce body movement, and sharpen chassis response while keeping the car practical enough for regular road use.

A Sportier Stance Without Going Straight to Coilovers

Lowering springs remain one of the most popular suspension modifications because they address two areas at once.

Appearance.

And handling.

Reducing the gap between the tire and fender gives the vehicle a more aggressive stance.

At the same time, revised spring characteristics can reduce body movement and improve how quickly the chassis responds to steering inputs.

For B10 S5 owners who do not need the height and damping adjustability of a full coilover kit, this provides a simpler option.

Designed Around the Factory Dampers

One of the most important features of the iE spring package is that the spring rates are developed to complement the original suspension dampers.

That means owners do not need to replace the entire shock-and-spring assembly simply to install the lowering springs.

For a relatively new vehicle, retaining the factory dampers can be attractive for customers who want additional control and a lower appearance without completely redesigning the suspension.

Sharper Steering Response

The revised spring characteristics are intended to make the B10 S5 respond more precisely to steering inputs.

Reduced suspension movement can help the chassis feel more immediate as the driver turns into a corner.

Combined with the iE sway bars, the springs can become part of a much more comprehensive handling package.

Reduced Body Roll

The performance-oriented spring rates also help limit excessive body movement.

Body roll isn't inherently bad—the suspension needs to move—but controlling unnecessary movement can make the car feel more planted when cornering.

That can give the driver greater confidence during spirited driving while maintaining the road-focused nature of the S5.

Lower Without Sacrificing Everyday Practicality

Extremely low suspension setups may look dramatic, but they can introduce compromises during normal use.

Driveways become more difficult.

Speed bumps become a concern.

Road imperfections become more noticeable.

iE describes the B10 S5 lowering springs as providing a calculated ride-height reduction intended to balance a sportier stance with practical ground clearance.

This makes them better suited to a street-driven performance car than a suspension package focused exclusively on achieving the lowest possible ride height.

Everyday Comfort Still Matters

The B10 S5 is still a premium road car.

It may be driven every day, used for commuting, or taken on long highway trips.

Integrated Engineering therefore designed the springs to add additional firmness and control without unnecessarily abandoning everyday ride quality.

That balance is important for an S5 build that needs to remain enjoyable beyond the occasional spirited drive.

A Complete iE B10 S5 Suspension Package

Put all three of the new B10 S5 components together and you have the foundation for a coordinated street-performance chassis setup.

The front sway bar can sharpen steering response and help control front body movement.

The rear sway bar can refine rotation and rear roll behavior.

The performance lowering springs reduce ride height, sharpen suspension response, and work with the original dampers.

Rather than choosing parts developed independently of one another, B10 S5 owners can build around components engineered by the same manufacturer for the same chassis.

That makes the combination particularly attractive for enthusiasts who want a more cohesive upgrade path.

B10 S5 Suspension Fitment

These three suspension products are designed for the 2025+ Audi S5 B10 platform.

Exact model year, trim, factory suspension configuration, and vehicle equipment should always be confirmed before ordering.

Shop the Integrated Engineering Performance Lowering Springs:
https://x-ph.com/integrated-engineering-performance-lowering-springs-for-audi-b10-s5/

Integrated Engineering Valved Cat-Back Exhaust for Audi B9/B9.5 S4

The fourth new addition is for a completely different Audi application.

The Integrated Engineering Valved Cat-Back Exhaust System is designed for the Audi B9 and B9.5 S4 3.0T, giving owners a way to increase exhaust character while retaining control over the volume.

This product should not be confused with the B10 S5 suspension upgrades above.

It is a separate exhaust application developed specifically around the earlier B9/B9.5 S4 3.0T platform.

More Sound When You Want It

Fixed exhaust systems force the owner to accept the same basic sound level in every situation.

A valved exhaust gives the driver another option.

Open the valves and the iE system provides a more aggressive, performance-oriented exhaust character.

Close them and the vehicle can operate with a quieter, more restrained sound for situations where additional volume isn't desirable.

That flexibility is especially useful on an S4 that still serves as a daily driver.

Control the Exhaust From the iE App

One of the most interesting features of this system is how the valves are controlled.

Rather than requiring owners to carry an additional handheld exhaust remote, Integrated Engineering uses its mobile app.

Compatible users can control the exhaust-valve setting through a smartphone, keeping the system integrated into the broader iE ecosystem.

That makes changing the exhaust behavior more convenient while eliminating another separate controller inside the vehicle.

Quiet for the Commute, Aggressive for the Back Road

A valved system makes particular sense on the B9/B9.5 S4 because these cars often have to perform multiple roles.

During the week, the S4 may be a comfortable commuter.

On the weekend, it may be the car taken out specifically for spirited driving.

The iE exhaust can adapt accordingly.

Close the valves for more restrained operation during normal driving.

Open them when you want a stronger 3.0T exhaust presence.

The driver is not permanently locked into either extreme.

Integration With Compatible iE ECU Tuning

Owners using compatible iE software can gain additional exhaust-valve functionality.

Integrated Engineering states that customers using the Pro or Apex tier of the iE B9 3.0T tuning suite can access manual exhaust valve control on demand, subject to the supported vehicle and software configuration.

This can provide greater direct control than relying exclusively on factory drive-mode behavior.

Vehicle-Specific B9/B9.5 Fitment

The exhaust is engineered around the S4's factory mounting locations rather than using universal exhaust components.

Vehicle-specific construction helps provide proper alignment, fit, and sealing when the system is correctly installed.

Professional installation is recommended to verify connections, valve function, alignment, and exhaust sealing.

Audi S4 Fitment

The iE Valved Cat-Back Exhaust is designed for:

Audi S4 B9
Audi S4 B9.5
Engine platform: Audi 3.0T

The exact model year, engine configuration, and exhaust application should be verified before purchase.

Customers specifically interested in manual valve control should also confirm that their iE software tier and current vehicle configuration support the desired functionality.

Shop the Integrated Engineering Valved Cat-Back Exhaust:
https://x-ph.com/integrated-engineering-valved-catback-exhaust-system-for-audi-b9-b9-5-s4-ieexck13/

Two Different Audi Platforms, One Performance-Focused Brand

These four additions cover two very different stages of the modern Audi performance lineup.

For the newest B10 S5, Integrated Engineering is giving owners the tools to start refining chassis behavior early in the platform's life.

Front and rear adjustable sway bars provide more control over roll stiffness and chassis balance.

Performance lowering springs sharpen the stance and suspension response while retaining the factory dampers.

For the B9/B9.5 S4, the new valved exhaust shifts the emphasis from handling to sound.

Instead of changing the way the car corners, it changes how the 3.0T communicates with the driver while preserving quieter operation when needed.

Build Your Audi Around How You Actually Drive

The best modification depends on what you want to change.

If your B10 S5 feels like it needs sharper turn-in, start with the front sway bar.

If you want to change the car's rotation and rear roll behavior, consider the rear sway bar.

If the factory ride height sits higher than you want, the iE springs provide a more aggressive stance without requiring a full coilover conversion.

And if your B9 or B9.5 S4 needs more personality from the exhaust, the iE valved cat-back gives you the flexibility to turn up the sound without leaving it loud all the time.

Each upgrade targets a different part of the driving experience.

Shop the Latest Integrated Engineering Audi Upgrades at Extreme Power House

The latest iE additions give Audi enthusiasts new options for improving handling, stance, chassis balance, and exhaust sound.

For the 2025+ Audi B10 S5

Integrated Engineering Rear Sway Bar Upgrade – IESSDF3
https://x-ph.com/integrated-engineering-rear-sway-bar-upgrade-for-audi-b10-s5-iessdf3/

Integrated Engineering Front Sway Bar Upgrade – IESSDF2
https://x-ph.com/integrated-engineering-front-sway-bar-upgrade-for-audi-b10-s5-iessdf2/

Integrated Engineering Performance Lowering Springs – IESSDF1
https://x-ph.com/integrated-engineering-performance-lowering-springs-for-audi-b10-s5/

For the Audi B9/B9.5 S4 3.0T

Integrated Engineering Valved Cat-Back Exhaust System – IEEXCK13
https://x-ph.com/integrated-engineering-valved-catback-exhaust-system-for-audi-b9-b9-5-s4-ieexck13/

Whether you're starting a new B10 S5 suspension build or adding more character to an established B9/B9.5 S4, these Integrated Engineering upgrades offer targeted ways to make your Audi more engaging.

Shop Integrated Engineering performance upgrades at Extreme Power House and build your Audi around the way you want it to drive.