# Title: Stainless Valved Catback Exhaust System for Audi B8 B8.5 S4 S5


## Description: Transform the sound and driving experience of your Audi S4 or S5 B8/B8.5 with the STRATEC Valved Exhaust System. Designed for the supercharged V6 platform, this system delivers a unique high-pitch tone while retaining deep, aggressive low-end character—creating a sound profile that stands out from traditional setups. Constructed entirely from T304 stainless steel and featuring a high-pitch X-pipe, the system runs 2.5-inch tubing from front to rear, enhancing exhaust flow and sound across the entire RPM range. Integrated vacuum-actuated valves, controlled via an included key fob remote, allow instant switching between refined cruising and an aggressive, motorsport-inspired exhaust note. Why It Works High-Pitch X-Pipe Design: Produces a sharper, more exotic tone while improving exhaust flow Vacuum Valve Control: On-demand sound adjustment using the included remote Mandrel-Bent Tubing: Optimized flow for improved throttle response and power delivery Sound & Control Valves Closed: Quiet and refined for daily driving and highway cruising Valves Open: Aggressive, high-energy exhaust tone with strong low-end and high-RPM excitement Remote Control: Instantly operate valves from inside the vehicle Construction & Details Material: T304 stainless steel for durability and corrosion resistance Weight Savings: Approx. 12.3 lbs lighter than factory exhaust Craftsmanship: Precision TIG welding and smooth mandrel bends Tubing Diameter: 2.5" from front to exhaust tips Vehicle Fitment 2010–2016 Audi S4 (B8 / B8.5) 2010–2016 Audi S5 (B8 / B8.5)


## Product type: Vehicle Parts & Accessories


## Vendor: Bull Boost Performance


## Tags: Bull Boost Performance, Shopify Collective


## Price range: 1899.95 - 1899.95 USD


## Link: https://shop.water-services.us/products/stainless-valved-catback-exhaust-system-for-audi-b8-b8-5-s4-s5


## Options 

- Title: Default Title


## Variants

- Default Title, SKU: 721814382433, Available: no, Inventory: 0, Delivery profile: Shopify Collective


## Metafields 

- google_product_category: 908
- badge: <div style='display:none' class='jdgm-prev-badge' data-average-rating='0.00' data-number-of-reviews='0' data-number-of-questions='0'> <span class='jdgm-prev-badge__stars' data-score='0.00' tabindex='0' aria-label='0.00 stars' role='button'> <span class='jdgm-star jdgm--off'></span><span class='jdgm-star jdgm--off'></span><span class='jdgm-star jdgm--off'></span><span class='jdgm-star jdgm--off'></span><span class='jdgm-star jdgm--off'></span> </span> <span class='jdgm-prev-badge__text'> No reviews </span> </div>
- widget: <div></div>
- review_widget_data: {"number_of_reviews":0,"average_rating":"0.00","number_of_questions":0,"product_name":"Stainless Valved Catback Exhaust System for Audi B8 B8.5 S4 S5","product_external_id":7408197402704,"product_coupons_enabled":true,"image_url":"https://cdn.shopify.com/s/files/1/0242/9940/5392/files/304B8.jpg?v=1786216431","histogram":[{"rating":5,"frequency":0,"percentage":0,"extra_class":null},{"rating":4,"frequency":0,"percentage":0,"extra_class":null},{"rating":3,"frequency":0,"percentage":0,"extra_class":null},{"rating":2,"frequency":0,"percentage":0,"extra_class":null},{"rating":1,"frequency":0,"percentage":0,"extra_class":null}],"review_keywords":null,"product_medals":[],"custom_form_filters_and_averages":null,"photo_gallery":null,"review_summary_text":"Be the first to write a review","ai_summary_text":"","sort_key":"created_at","multi_language_sorting_enabled":true,"metafield_updated_at":"2026-08-08T19:15:01Z","primary_language":"en","primary_language_reviews":[],"primary_language_pagination":{"total_pages":0,"current_page":1,"per_page":5},"other_language_reviews":[],"other_language_pagination":{"total_pages":0,"current_page":1,"per_page":3},"reviews":[]}
- product_status: {"pending":0,"failed":0,"approved":1}
- unavailable_reason: collective_supplier_curator_connection_ended