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Unitronic Cat-Back Exhaust System for B8/B8.5 Audi S4/S5

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Brand : Unitronic
MFG Part # : UH011-EXA
SEM Part # : UH011-EXA
Price : CAD $ 2,989.99

Unitronic Cat-Back Exhaust System for B8/B8.5 Audi S4/S5
CAD $ 2,989.99


Unitronic is pleased to present its 2.5” Cat-Back Exhaust System for the B8/B8.5 S4 and S5. Featuring TIG welded T304 Stainless Steel CNC mandrel bent construction, T316 stainless steel flanges, and a straight-through, free flowing design; Unitronic’s Cat-Back Exhaust Systems are designed to remove the factory exhaust restrictions to unleash the full potential of the engine. 

Like all of Unitronic’s Performance Exhaust Systems, a unique v-band fastener system, using T316 Stainless Steel flanges was utilized to ensure a leak proof connection every time. This is achieved through a locking ring on all Unitronic v-band flanges to guarantee a centric alignment of the two flanges. Unitronic’s Cat-Back Exhaust System features a high density, high temperature glass fiber muffler packing, and engraved Unitronic logo. These attributes combined ensure maximum performance, while maintaining a comfortable and unobtrusive tone inside the cabin. Exiting at the rear, exhaust gasses pass through dual 3” slash cut tips and engraved with the Unitronic logo.

  • Dual 2.5-inch T304 stainless steel:
    Top quality material that will not rust and will outlast your vehicle.
  • T316 stainless steel flanges:
    Durable, rust proof and laser cut.
  • Brushed finish matte finish:
    Brushed matte finish for the best possible look.
  • 4-inch Corrugated stainless steel flex section: 
    High quality flex with interlock construction that will stay leak proof for years; allows engine movement without stressing the factory rubber mounts
  • Polished 3-inch Double walled exhaust tips:
    Mirror polished tips with engraved Unitronic Logo.
  • Flow-match transitions:
    Flow-matched transitionsfor maximum performance and airflow.
  • Integrated X pipe:
    Reduce unwanted sound frequency; unique exhaust tone.
  • Sound absorption technology:
    Perforated chamber packed with high quality and durable high temperature fiberglass wool; ensures a deep tone while absorbing unwanted frequency.
  • Sound Reflection:
    : Sound reflection chamber used to cancel drone noise and to ensure comfortable sound level in the cabin.
  • Straight-through, free flowing muffler design: 
    Optimal performance achieved by removing restriction and reducing back pressure.
  • TIG welded construction: 
    Professionally TIG welded to ensure longevity, durability and top tier craftsmanship.
  • Unique v-band fastening system featuring Clampco® clamps: 
    Maintain a perfect alignment of v-band flanges while ensuring a leak-proof connection every time. Fully reusable and quick to install.

Hardware Included

  • Unitronic Left Downpipe Section
  • Unitronic Right Downpipe Section
  • Unitronic Front Resonator Section
  • Unitronic Mid Resonator Section
  • Unitronic Left Rear Muffler
  • Unitronic Right Rear Muffler
  • All Necessary Hardware Included

Recommended Software

  • Stage 1
  • Stage 1+
  • Stage 2+



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This product may not fit all vehicles listed. Please guarantee that this is the correct part for your application, or contact us for more information. At times our suppliers may substitute a brand of similar or equal quality, without our prior knowledge. If you require a specific brand for your application, call us before ordering.

Application Guide

SEM Motorsports Ltd : German Auto Parts Supplier

Canadian German auto parts supplier and maintenance facility for Volkswagen / Audi / Porsche specializing in Parts Sales / Repair / Maintenance. Located in Toronto Ontario Canada. Lowest Prices & Fast Shipping!

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