Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

Your Satisfaction Matters:
Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

Shipping Information:

At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.

Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.

Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.

Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.

Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.

Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.

You can also track your order here

Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.

Happy Driving!

Audi B9 S4 & S5 Valved Exhaust System

Full T304 Stainless Steel System with Electronic Valve Control

Overview

The Audi B9 S4 and S5, powered by the EA839 3.0L V6, have impressive performance potential—but the stock exhaust hides much of this engine’s true character. The Valvetronic Designs Full Valved Exhaust System unleashes its voice, delivering an aggressive, motorsport-inspired tone when desired, and stock-like refinement when needed.

Unlike typical setups requiring multiple components from different vendors, our system is engineered as a complete solution—from the OEM or aftermarket downpipe all the way to the exhaust tips. This single-package design eliminates the need for mixing and matching resonator sections or axle-backs from other brands, ensuring perfect fitment, seamless performance, and consistent sound quality.

With valves open, expect a bold exhaust note, pronounced overrun crackles, and a commanding presence. With valves closed, the car returns to quiet factory manners, with zero drone when paired with the OEM downpipe.

For those upgrading from the V8-powered B6 or B7 S4, our system delivers the level of engagement and emotional sound you’ve been missing—ensuring your B9 ownership experience is just as exciting.

Why It Works

• One-Piece System Design: Eliminates the need for mixing components from multiple vendors.

• Electronic Valve Control: Switch between aggressive and refined sound instantly.

• Mandrel-Bent Construction: Maximizes flow for improved throttle response and power.

Sound & Control

• Valves Open: Aggressive tone with rich midrange and sharp overrun crackles on deceleration.

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

• No Drone: When paired with the OEM downpipe, cabin comfort is unaffected.

Construction & Options

• Material: T304 stainless steel for long-term durability and corrosion resistance.

• Weight Savings: 16.4 lb lighter than the OEM exhaust system.

• Craftsmanship: Precision TIG welds and mandrel bends for optimal flow and strength.

• Tips: Includes premium exhaust tips for a finished, performance-oriented look.

Fitment

• 2017–2024 Audi S4 (B9)

• 2018–2024 Audi S5 (B9)

Installation Notes

• Direct-fit for sedan models.

• Coupe models require modification to shorten the mid-section for proper fitment. Contact info@valvetronic.com for guidance.

• 100% reversible—return to stock at any time.

What’s Included

• Full T304 stainless steel valved exhaust system

• Electronic exhaust valves with key fob remote system

• All necessary clamps and hardware

Specifications

• Tubing: Full mandrel-bent T304 stainless steel

• Valves: Electronic, remote-controlled

• Weight Savings: 16.4 lb lighter than OEM

• Finish: Brushed stainless steel