Order link:

https://x-ph.com/apr-catback-exhaust-system-s4-s5-b9-cbk0012/

The APR Catback Exhaust System for Audi B9 S4 and S5 (CBK0012) is a high-performance exhaust solution designed to run the entire length of the vehicle, from the catalyst back. Tailored for the Audi B9 S4 and S5 (model years 2018-2023), this exhaust system delivers a substantial performance boost with a gain of 10 horsepower and 12 FT-LBS of torque. It offers an aggressive sound profile and includes customizable tips, adding both style and power to your vehicle.

Constructed from premium T304 stainless steel with a brushed finish and TIG welding, the APR Catback system ensures durability and longevity. This full-system upgrade features oversized downpipes, midpipes, and straight-through mufflers designed to minimize flow restrictions for maximum performance. The system also features an integrated Helmholtz resonator, which reduces drone and enhances sound quality, ensuring a perfect balance between power and a refined exhaust note.

Additionally, the valve-controlled rear mufflers adjust dynamically based on driving conditions—louder during aggressive driving and quieter when cruising. The dual 3.5” polished motorsport-style tips add a performance-oriented look, and installation is made simple with precise brackets, OEM-style slip clamps, and an upgraded tunnel brace.

Fitment:

• Audi B9 S4: 2018-2025
• Audi B9 S5: 2018-2025
• Audi B9 S5 Sportback: 2018-2025

Features:

• Full catalyst-back system with downpipes extending from the factory catalyst.
• Gain of 10 HP and 12 FT-LBS torque to all four wheels for Audi B9 S4/S5.
• Constructed from T304 stainless steel with brushed finish and TIG welding.
• Oversized dual 2.5” downpipes, dual 2.75” midpipes, and 3.5” midpipe for optimal flow.
• Integrated Helmholtz resonator to minimize drone and improve sound.
• Valve-controlled rear mufflers adjust exhaust sound based on driving style.
• Lightweight, polished 3.5” motorsport-style exhaust tips with APR logo.
• OEM-style slip clamps, precision brackets, and upgraded tunnel brace for easy fitment.
• Fully emissions-compliant for a trouble-free installation.
• Optional tip finishes available for a personalized look.

Specs:

• Material: T304 Stainless Steel
• Tip Count: 4
• Tip Diameter: 3.5 IN
• Tip Finish: Polished Stainless Steel
• Tube Diameters: 2.5 IN, 2.75 IN, 3.5 IN
• Valve Actuation: OEM Control System
• Muffler Style: Helmholtz Sound Absorption
• Part Number: CBK0012
• Emission Code: 5 (Emissions Compliant)