Description

APR CBK0012 – Catback Exhaust System – S4 / S5 (B9)

APR Catback Exhaust System – S4 / S5 (B9)

Fits Audi S4 18-25, S5 18-25

Designed for enthusiasts seeking the perfect balance of power, sound, style, and quality, the APR Catback Exhaust System for the Audi B9 S4 and S5 is a testament to engineering excellence. With its performance-driven design and durable construction, this system not only transforms your driving experience but also ensures years of reliable performance.

Complete catalyst-back system including downpipes, extending from the factory catalyst back.
Performance gains of 10 HP and 12 FT-LBS of torque delivered to all four wheels.
Premium T304 stainless steel construction with TIG welding for strength and durability.
Optimized flow through dual 2.5” downpipes, 2.75” midpipes, and a 3.5” midpipe.
Mandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.
Precision brackets and slip clamps ensure accurate alignment and hassle-free installation.
Includes an upgraded tunnel brace to accommodate the larger piping.
Integrated Helmholtz resonator minimizes drone and enhances sound quality.
Valve-controlled rear mufflers dynamically adjust sound based on driving style.
Removable quad 3.5” motorsport-style polished tips with APR logo; optional styles available.
Smooth transitions and straight-through components maximize performance by reducing restrictions.
Strikes the perfect balance of power, sound, style, and quality for enthusiasts.
Fully emissions compliant for worry-free operation.

Brackets: PreciseBrand: APRCategory: ExhaustClamping Type: Slip ClampClamps Included: YesEmission Code: 5Exhaust Tip Color: PolishedExhaust Tip Diameter: 3.5Exhaust Tip Finish: Carbon Fiber with Brushed InlayExhaust Tip Quantity: 4Exhaust Tip Removable: YesFinish: BrushedGrade Type: PerformanceHangers Included: YesMain Piping Diameter: 2.50Main Piping Diameter: 2.75Main Piping Diameter: 3.50Material: T304 Stainless SteelMuffler Finish: BrushedMuffler Quantity: 2Muffler Type: HelmholtzMuffler Type: Sound AbsorptionPipe Bend Type: MandrelPipe Material: T304 Stainless SteelProduct Type: Exhausts (Catback Systems)Sub Category: Exhaust and Tail PipesSystem Type: CatbackTail Pipe Outlet Outside Diameter: 2.5Tube Connection: Butt JointValve Included: YesValve Type: OEMWarning: California Proposition 65Welding: TIG