Skip to content
Buy now, pay later with Klarna at checkout. Pay in 30 days or split it over 3 months.
Buy now, pay later with Klarna at checkout. Pay in 30 days or split it over 3 months.
  Awaiting stock. Order today for dispatch in 16 working days.

APR Cat Back Exhaust System - Audi S3 8V Saloon

The APR Catback Exhaust System personalises your vehicle’s looks, sound and performance. Beautifully hand-crafted T304-stainless-steel components adorn the system with stunning TIG-welding throughout. Our straight-through brushed-finished mufflers smooth the exhaust note to a deep growl, without adding restrictions, while our Helmholtz resonator reduces unwanted frequencies. Strong high-quality bracketry and OEM-style clamps hold the system steadily in place, making the install or removal a snap, and fitment simple, yet precise. A cast 3” to quad 2.5” rear splitter creates an ultra-smooth transition, steadily feeding exhaust gasses out of the system, while looking tidy from under the rear bumper. Our cast valve housings enable the vehicle to be fitted with the factory electronic valve actuators, retaining OEM valve operation. Finally, removable 4" polished slash-cut exhaust tips finish the system, adding a classy motorsport-inspired touch to the rear of the vehicle.

Quick Facts

  • T304 stainless-steel construction
  • Argon-back-purged TIG welding throughout
  • Single 3" to quad 2.5" mandrel-bent brushed tubing
  • Ultra-smooth cast 3" to quad 2.5" splitter
  • Brushed-finished straight-through sound-absorption mufflers and Helmholtz frequency reducing resonator
  • Polished 4" slash-cut exhaust tips (removable)
  • Cast valve housings and brackets for OEM electronic actuators
  • Rugged and precise mounting brackets
  • OEM style slip clamps and Torca AccuSeal T304 tip clamps
  • Direct fit to the OEM and APR Race DP exhaust systems with the included link and reducer pipes
  • Low-profile design, suitable for lowered vehicles
  • Larger diameter piping compared to stock
  • Larger diameter tips compared to stock
  • No increase in weight compared to stock
  • Designed, developed, assembled and quality controlled in-house
  • Easy to install
  • Limited lifetime warranty

The APR exhaust system uses larger piping compared to the factory exhaust system, yet weighs the same. We use 3" OD piping, which then splits to a quad 2.5" design. The factory system uses 2.57" piping before the resonator and 2.78” thereafter. Finally, our system’s 4" exhaust tips dwarf the factory oval tips, giving the rear of the vehicle a sportier look.

  • We deliver to every country in the world, if shipping rates are not available at checkout please contact us.
  • Some item(s) are not actively held in stock and usually sell out quickly, please contact sales to perform a stock check if you are unsure.
  • Full tracking is available for all orders, you will receive tracking and dispatch updates via email.
  • It can take up-to 16 working days for out of stock orders to be dispatched.
For more shipping & delivery information, please click here.
We offer fitting on most of our products at our facility in Warrington, Cheshire. Please contact us to get a quote on have us fit your products.
Ultimate Customs Group LTD do not accept any liability if damage is caused to your car by the installation of this product.

Professional installation is recommended on all of our products. Please contact us to see if we offer a fitting service for the item(s) you wish to purchase.