XForce Audi S3 8V Saloon VAREX Cat-Back Exhaust & SmartBox 3″ – ES-AS313S-VMKSB-CBS
Upgrade your **Audi S3 8V Saloon** with the **XForce 3″ VAREX Cat-Back Exhaust System with SmartBox**, part number **ES-AS313S-VMKSB-CBS**.
Built from premium **304 stainless steel**, this direct-fit performance exhaust combines a free-flowing 3-inch system with an electronically controlled **VAREX rear muffler**, allowing you to adjust the exhaust sound whenever required.
Key Features:
- 3″ 304 stainless steel cat-back exhaust
- VAREX electronically controlled rear muffler
- SmartBox controller included
- Centre resonator
- Quad 4″ polished stainless steel exhaust tips
- Designed for Audi S3 8V Saloon / Sedan
- XForce Part Number: ES-AS313S-VMKSB-CBS
Only 1 left in stock
Delivery & Return
We aim to dispatch orders as quickly as possible using reliable UK courier services. Delivery times can vary depending on stock availability, supplier location and the type of product ordered.
Estimated delivery times are shown where available, but these should be treated as a guide rather than a guaranteed delivery date.
Some specialist, made-to-order, imported or supplier-direct performance parts may take longer to arrive. If you need a part by a specific date, we recommend checking availability before ordering.
Once your order has been dispatched, tracking information will be provided where available.
UK Delivery
We deliver throughout the United Kingdom.
Shipping charges are calculated at checkout based on the size, weight and destination of your order. Larger or heavier items may have an additional delivery charge.
Deliveries to the Scottish Highlands, Northern Ireland, Isle of Man, Isle of Wight, Channel Islands and other remote locations may take longer or incur additional charges.
International Delivery
International shipping may be available for selected products and destinations.
Import duties, taxes, customs charges and local handling fees are the responsibility of the customer unless stated otherwise. These charges are not included in the product price or standard shipping cost.
Please check your local import requirements before placing an international order.
Incorrect, Damaged or Faulty Items
Please inspect your order as soon as it arrives.
If your item is damaged in transit, faulty or different from what you ordered, contact us as soon as possible with your order number and clear photographs where relevant.
We will review the issue and advise you of the appropriate next steps.
Vehicle Fitment & Compatibility
It is the customer’s responsibility to check that a product is suitable for their vehicle before installation.
Please verify the vehicle model, year, engine, chassis code, part number and any relevant brake, suspension or drivetrain specification before ordering.
If you are unsure about compatibility, contact us before purchase with your vehicle registration or VIN and the product SKU where possible.
We cannot accept responsibility for incorrect fitment caused by inaccurate vehicle information, non-standard modifications or aftermarket conversions that were not disclosed before purchase.
Special Order & Made-to-Order Products
Some performance parts are specially ordered, imported, customised or manufactured specifically for a customer.
These products may be subject to different cancellation and return conditions. Where applicable, this will be confirmed before the order is processed.
Refunds
Approved refunds are normally issued back to the original payment method after the returned item has been received and inspected.
Original delivery charges and return postage may not be refundable unless the item is faulty, damaged or supplied incorrectly.
Please allow time for your bank or payment provider to process the refund after it has been issued.
Need Help?
If you have any questions about delivery, returns or product compatibility, please contact Performance Car Parts UK before ordering. We will be happy to help you check product details and fitment information.
XForce Audi S3 8V VAREX Cat-Back Exhaust with SmartBox
Transform the sound and character of your Audi S3 8V Saloon with the XForce VAREX 3″ Cat-Back Exhaust System with SmartBox – ES-AS313S-VMKSB-CBS.
Developed specifically for the Audi S3 8V Sedan/Saloon platform, this premium performance exhaust combines a high-flow 3-inch exhaust system with XForce’s electronically controlled VAREX valved rear muffler. The result is an exhaust system capable of providing a more aggressive performance note when desired while still allowing the driver to reduce exhaust volume for everyday driving.
Adjustable VAREX Exhaust Sound
The key feature of the XForce Audi S3 8V VAREX exhaust is its electronically controlled valve system. Rather than being restricted to one fixed exhaust volume, the VAREX muffler changes the exhaust gas path through the rear silencer.
The included VAREX SmartBox controller provides additional control through XForce’s compatible control system, giving the driver far greater flexibility over the exhaust behaviour.
This makes the system particularly suitable for S3 owners who want a more purposeful performance exhaust without having maximum exhaust volume at all times.
3-Inch High-Flow Exhaust System
XForce uses 3-inch diameter stainless steel pipework throughout the system to provide a freer-flowing exhaust path compared with a restrictive factory-style system.
The system incorporates a centre resonator before gases reach the VAREX rear muffler, helping create a balanced exhaust character while maintaining the performance-focused design of the system.
304 Stainless Steel Construction
The ES-AS313S-VMKSB-CBS is manufactured from durable 304-grade stainless steel, offering excellent resistance to corrosion and making it particularly suitable for performance cars driven throughout the year in UK conditions.
The system features brushed stainless pipework, precision-fabricated components and polished exhaust outlets for a premium appearance beneath the Audi S3.
Quad 4-Inch Polished Exhaust Tips
At the rear, the XForce system retains the aggressive quad-exit appearance associated with the S3 while upgrading it with four polished 4-inch stainless steel exhaust tips.
The larger outlets complement the rear styling of the Audi S3 8V Saloon while giving the vehicle a more purposeful performance appearance.
Designed for the Audi S3 8V Saloon
This particular XForce part number is intended for the Audi S3 8V Sedan / Saloon. The saloon exhaust system differs from the corresponding S3 Sportback system, so body style should be checked carefully before ordering.
The Audi S3 8V uses a turbocharged 2.0 TFSI petrol engine with quattro all-wheel drive. Listings for this exhaust commonly specify compatibility across the 8V-generation S3 Saloon range. Vehicle production dates, exhaust configuration and any market-specific differences should still be confirmed before installation.
Why Choose the XForce VAREX System?
- Adjustable sound: VAREX electronic valve provides controllable exhaust volume.
- SmartBox included: Advanced electronic control functionality supplied with the system.
- Performance design: Free-flowing 3-inch exhaust pipework.
- Premium material: Durable 304-grade stainless steel construction.
- Resonated configuration: Centre resonator helps shape the exhaust note.
- Premium appearance: Quad polished 4-inch exhaust outlets.
- Vehicle-specific fitment: Engineered for the Audi S3 8V Saloon/Sedan platform.
What’s Included?
- XForce 3″ stainless steel cat-back exhaust pipework
- Centre resonator section
- XForce VAREX R-Series valved rear muffler
- Quad 4″ polished stainless steel exhaust tips
- VAREX SmartBox control unit
- Associated exhaust installation components supplied by XForce
XForce ES-AS313S-VMKSB-CBS
If you’re looking for an Audi S3 8V valved exhaust that combines premium stainless-steel construction, a larger 3-inch exhaust system and adjustable sound control, the XForce ES-AS313S-VMKSB-CBS VAREX Cat-Back Exhaust provides a complete vehicle-specific upgrade for the S3 8V Saloon.
Important: Please confirm your vehicle’s exact model, body style and exhaust configuration before ordering. This part number is intended for the Audi S3 8V Saloon/Sedan and should not be assumed to fit the Sportback version.
Technical Specification
Key Features & Benefits
Discover the main benefits of the XForce VAREX Cat-Back Exhaust System
with SmartBox Controller.
| Adjustable Exhaust Sound |
XForce VAREX technology allows the exhaust character to be adjusted electronically, giving you more control over the sound of the vehicle. |
|---|---|
| SmartBox Control |
Includes the XForce SmartBox system for enhanced control of the VAREX exhaust valve. |
| Daily Driving Flexibility |
Reduce the exhaust volume when you want a more restrained driving experience, then open the system when a stronger performance sound is preferred. |
| Performance Exhaust Character |
Designed to provide a deeper and more purposeful exhaust note that better suits the performance character of the Audi S3. |
| Premium Construction |
Manufactured using high-quality stainless steel for durability, corrosion resistance and long-term use. |
| Improved Rear Styling |
Gives the rear of the vehicle a more aggressive and performance-focused appearance. |
| Vehicle-Specific Design |
Developed as a dedicated cat-back exhaust upgrade rather than a universal exhaust system. |
| Suitable for Modified Cars |
A strong choice for road-going performance builds where the owner wants both sound control and a sportier exhaust setup. |
| Balanced Road Use |
The VAREX system gives greater flexibility than a permanently loud exhaust, making it better suited to mixed road use. |
Please refer to the Vehicle Fitment tab for model-specific
application details.
Vehicle Fitment
Compatible Vehicles
Vehicle compatibility information for the XForce VAREX 3″ Cat-Back Exhaust System with SmartBox Controller.
| Year | Make | Model | Submodel / Chassis | Engine |
|---|---|---|---|---|
| 2013 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2014 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2015 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2016 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2017 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2018 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2019 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
| 2020 | Audi | S3 | Saloon / Sedan (8V) | 2.0L TFSI Turbo Petrol |
This product is intended for compatible Audi S3 8V
Saloon / Sedan models. The Sportback / Hatchback version
uses a different XForce exhaust application. Please confirm the exact
vehicle specification before ordering.
| Weight | 32.00 lbs |
|---|---|
| Dimensions | 119 × 38 × 46 in |
Delivery & Returns
UK Delivery
We deliver throughout the United Kingdom using reliable courier services. Delivery times vary depending on stock availability, supplier location, product size and destination.
Shipping charges are calculated at checkout where applicable. Larger, heavier, specialist or supplier-direct items may incur additional delivery charges.
Dispatch Times
We aim to dispatch in-stock products as quickly as possible. Some specialist, imported, made-to-order or supplier-direct performance parts may require additional processing time.
If you require a product by a specific date, please contact us before ordering so availability can be checked.
Tracking
Tracking information will be provided where available once your order has been dispatched.
International Delivery
International shipping may be available for selected products and destinations. Import duties, taxes, customs charges and local handling fees are normally the responsibility of the customer unless otherwise stated.
Returns
Please contact us before returning an item. Products should be returned in accordance with our returns policy and in suitable condition where applicable.
Special-order, made-to-order, customised or imported products may be subject to different cancellation and return conditions.
Damaged, Faulty or Incorrect Items
Please inspect your order as soon as it arrives. If an item is damaged, faulty or different from what you ordered, contact us promptly with your order number and clear photographs where relevant.
Vehicle Fitment
It is the customer’s responsibility to confirm product compatibility before installation. If you are unsure, contact us with your vehicle registration or VIN and the product SKU before ordering.
