Stainless Valved Catback Exhaust System for Audi B9 S4 S5

$1,999.95 USD

Before You Order

Confirm fitment, lead time, and install details before checkout.

Fitment Support In Stock / Made To Order Returns Check
Fitment Check Confirm year, make, model, trim, bumper style, wiring, and selected options before checkout.
Build Details Photos, vehicle search, and recommendations are helpful guides; final fitment can vary by build.
Lead Time In-stock items move fastest. Made-to-order specialty parts may need extra preparation before tracking updates.
Inspect First Inspect every part before painting, drilling, cutting, modifying, or installing it.
Not sure it fits? Send your vehicle details and product link to support@vektomotorsports.com. Ask Support

COMPLETE YOUR SETUP

The Audi B9 S4 and S5, powered by the EA839 3.0L V6, offer strong performance from the factory—but the stock exhaust limits the engine’s true sound and character. The STRATEC Valved Exhaust System unlocks a more aggressive, performance-driven exhaust tone while retaining refined, OEM-like manners when desired.

Engineered as a complete, one-piece exhaust system, this setup runs from the downpipe connection to the exhaust tips, eliminating the need to mix components from multiple suppliers. The result is consistent sound quality, proper fitment, and seamless performance.

With valves open, expect a bold, motorsport-inspired exhaust note with pronounced overrun crackles. With valves closed, the system returns to a quiet, refined tone suitable for daily driving—without unwanted drone when paired with the factory downpipe.

Why It Works

  • Complete One-Piece System: No mixing of axle-backs or resonators

  • Electronic Valve Control: Instantly switch between aggressive and refined sound

  • Mandrel-Bent Design: Optimized exhaust flow for improved throttle response and power

Sound & Control

  • Valves Open: Aggressive tone with strong midrange and sharp overrun crackles

  • Valves Closed: Quiet, refined, and OEM-like for daily driving

  • No Drone: When used with the factory downpipe

Construction & Details

  • Material: Full T304 stainless steel construction

  • Weight Savings: Approx. 16.4 lbs lighter than factory exhaust

  • Craftsmanship: Precision TIG welding and smooth mandrel bends

  • Exhaust Tips: Includes premium tips for a clean, performance-oriented finish

Vehicle Fitment

  • 2017–2024 Audi S4 (B9)

  • 2018–2024 Audi S5 (B9)

Description

The Audi B9 S4 and S5, powered by the EA839 3.0L V6, offer strong performance from the factory—but the stock exhaust limits the engine’s true sound and character. The STRATEC Valved Exhaust System unlocks a more aggressive, performance-driven exhaust tone while retaining refined, OEM-like manners when desired.

Engineered as a complete, one-piece exhaust system, this setup runs from the downpipe connection to the exhaust tips, eliminating the need to mix components from multiple suppliers. The result is consistent sound quality, proper fitment, and seamless performance.

With valves open, expect a bold, motorsport-inspired exhaust note with pronounced overrun crackles. With valves closed, the system returns to a quiet, refined tone suitable for daily driving—without unwanted drone when paired with the factory downpipe.

Why It Works

  • Complete One-Piece System: No mixing of axle-backs or resonators

  • Electronic Valve Control: Instantly switch between aggressive and refined sound

  • Mandrel-Bent Design: Optimized exhaust flow for improved throttle response and power

Sound & Control

  • Valves Open: Aggressive tone with strong midrange and sharp overrun crackles

  • Valves Closed: Quiet, refined, and OEM-like for daily driving

  • No Drone: When used with the factory downpipe

Construction & Details

  • Material: Full T304 stainless steel construction

  • Weight Savings: Approx. 16.4 lbs lighter than factory exhaust

  • Craftsmanship: Precision TIG welding and smooth mandrel bends

  • Exhaust Tips: Includes premium tips for a clean, performance-oriented finish

Vehicle Fitment

  • 2017–2024 Audi S4 (B9)

  • 2018–2024 Audi S5 (B9)

Fitment & Install Notes

Fitment first: Confirm your vehicle year, make, model, trim, bumper style, wiring, and product options before checkout. Product photos, vehicle search, and recommendations are helpful guides, but final fitment can depend on trim, modifications, and install setup.

  • Installation: Professional installation is recommended for lighting, exhaust, carbon fiber, steering wheel, brake, and body components.
  • Lead time: In-stock items move fastest. Made-to-order specialty parts may need extra preparation before tracking updates.
  • Before install: Inspect all parts before painting, drilling, cutting, modifying, or installing. Contact us first if anything looks incorrect.
  • Need help? Email support@vektomotorsports.com before purchase if you want fitment support for your build.