XForce AUDI S3 8Y and 8V Hatch Varex Valved Cat Back Exhaust System with SmartBox

Unleash the full potential of your Audi 8Y or 8V S3 Sedan with the XFORCE VAREX SmartBox-equipped cat-back exhaust system. This system doesn’t just upgrade your exhaust—it redefines how you experience sound and control behind the wheel.

Constructed from brushed 304 stainless steel, the system features 3” mandrel-bent piping, a hot dog resonator, and a redesigned VAREX valved rear muffler, giving you a bold, aggressive tone when open and a refined, near-stock sound when closed. It’s daily-drivable with the flexibility to turn heads when you want to.

Paired with our VAREX SmartBox, you gain the most advanced exhaust control available. Choose from:

• Matrix Mode: Automatically adjust valve position based on speed, RPM, or throttle input.
• Manual Mode: Fine-tune valve position in real time via the XFORCE app or remote.
• Geo Mode: Program valve behavior by location - quiet in your neighborhood, loud on your favorite backroad.
• Factory Mode (with optional cable): Seamlessly link exhaust behavior to your Audi's built-in drive mode settings.

System Features:

• 3” mandrel-bent 304 stainless steel construction
• Drone canister tube for reduced cabin drone
• Redesigned VAREX valved muffler for maximum sound range
• Quad 4” Polished double-wall tips
• Bolt-on design with all necessary hardware included
• Includes VAREX SmartBox for full app control
• Drive mode integration harness included

Specifications

• Part No: ESAS38YHVKSB
• Vehicle Model: S3
• Diameter [in]: 3 Inch
• Material: 304 Stainless Steel
• Instruction Manual: VW_MK7_R_CAT_BACK1_1.pdf

Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here. 

Vehicle Fitment
If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.

NOTE
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.