APR Cat-Back Exhaust w/ Valves (AUDI S3 SPORTBACK MK3 TYP 8V)

Our 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. The diagram below shows the system with rear mufflers and valves, which can optionally be removed.

Mufflers and Resonators
The rear mufflers are responsible for reducing the exhaust note and do so without adding unnecessary restrictions to the system. Each unit features two straight-through perforated tubes that are tightly wrapped with stainless steel and fiberglass material. With the valves closed, the system is tamer, but once opened, the system sounds deep, throaty and aggressive! The mufflers have a beautiful brushed finish, and are tucked high in the exhaust tunnel, making them perfect for lowered vehicles and a treat to see when looking at the vehicle from the rear.

The front resonator is responsible for eliminating unwanted sound frequencies from the cabin. This is done without introducing added restrictions to the system. Using Helmholtz technology, sound waves bounce through the chamber and back into the exhaust stream, eliminating the undesirable frequencies to make the exhaust note more pleasing. During cruise, with the valves closed, the system remains calm.

Valveless System
For the more track minded enthusiasts where weight, sound and price point all are highly desired metrics, the APR Valveless system is available. In this configuration the axle back portion of the exhaust has the mufflers and valves removed. Weight drops considerably and the system becomes more aggressive. With the factory DP in place, the system is louder and more aggressive, but thanks to the center Helmholtz chamber, drone is reduced, giving a more pleasant, yet aggressive driving experience. However, when upgrading to the APR Race DP, the system transforms and becomes unapologetically raw with maximum aggression - A true track enthusiast's dream.

Created In-House
Our exhaust systems are proudly designed, developed, assembled and quality controlled in-house at the APR 78,000 sq.ft performance campus in Opelika, Alabama.

• 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
• Optional configuration removes the valves and rear mufflers
• Polished 4" slash-cut exhaust tips (removable and upgradable)
• Cast valve housings and brackets for OEM electronic actuators
• Optional configuration removes the valves and rear mufflers
• 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 pipesv
• 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 and a good weight reduction on the valveless system
• Designed, developed, assembled and quality controlled in-house
• Easy to install
• Limited lifetime warranty