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APR CBK0012 Cat-Back Exhaust System for Audi - S4/S5 B9

(2018-2025 Audi S4; 2018-2024 Audi S5; 2018-2025 Audi S5 Sportback)

Part of: APR Cat-Back Exhaust System

Other options in this family: APR CBK0047 APR CBK0050 APR CBK0057 APR CBK0053 APR CBK0001

Manufacturer

Picture for manufacturer APR

Part Number

CBK0012
6 reviews
Sale Price

$2,149.95

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The APR CBK0012 Cat-Back Exhaust System transforms the performance and sound of your B9 Audi S4 or S5 with precision-engineered components designed for enthusiasts who demand both power and refinement. This complete exhaust system delivers measurable performance gains of 10 HP and 12 ft-lbs of torque to all four wheels while maintaining full emissions compliance for worry-free daily driving.

Performance Features:

  • Optimized exhaust flow through dual 2.5" downpipes, 2.75" midpipes, and a 3.5" midpipe for maximum efficiency
  • Valve-controlled rear mufflers dynamically adjust sound based on driving mode and throttle input
  • Integrated Helmholtz resonator minimizes cabin drone while enhancing exhaust note quality
  • Performance gains of 10 HP and 12 ft-lbs of torque delivered to all four wheels
  • Fully emissions compliant design for legal operation

Construction and Installation:

  • Premium T304 stainless steel construction with TIG welding throughout for superior strength and corrosion resistance
  • Precision-engineered mounting brackets and slip clamps ensure proper alignment and straightforward installation
  • Includes upgraded tunnel brace specifically designed to accommodate the larger diameter piping
  • Removable quad 3.5" motorsport-style polished tips feature the APR logo; optional tip styles available

This exhaust system represents the perfect balance of power, sound quality, style, and durability for the discerning Audi performance enthusiast. APR's engineering expertise ensures a refined exhaust note that's aggressive when you want it and civilized during daily commuting.

Products specifications

Fits

2018-2025 Audi S4; 2018-2024 Audi S5; 2018-2025 Audi S5 Sportback

Bending

Mandrel

Brackets

Precise

Brand

APR

Category

Exhaust

Clamp Style

Slip Clamp

Clamps Included

Yes

Emission Code

5

Exhaust Tip Color

Polished

Material

T304 Stainless Steel

Muffler Finish

Brushed

Muffler Style

Sound Absorption, Helmholtz

Product Type

Exhausts (Catback Systems)

Sub Category

Exhaust and Tail Pipes

Tip Count

4

Tip Diameter

3.5

Tip Finish

Carbon Fiber with Brushed Inlay

Tips Removable

Yes

Tube Connection

Butt Joint

Tube Diameter

2.5

Tube Diameter

2.75

Tube Diameter

3.5

Tube Finish

Brushed

Valve Actuation

OEM

Valves

Yes

Warning

California Proposition 65

Welding

TIG

excellent service at a very competitive price

Good price on good tires

Great pricing!

Smooth transaction and fast shipping.

Easy and fast

It was fast and easy!

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