APR

APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25

SKU: CBK0012
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
APR Catback Exhaust System - S4 / S5 (B9) Fits Audi S4 18-25, S5 18-25
$2,799.99
Availability:
  • Description
  • Fitment
  • Refund Policy
Overview
Introducing the APR Catback Exhaust System for the Audi B9 S4 and S5 The APR Catback Exhaust System for the Audi B9 S4 and S5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. Inspired by the larger center-pipe design of the higher-output RS4 and RS5 models, this system is engineered to boost performance, elevate sound, and enhance aesthetics with customizable exhaust tips that are sure to make a statement. Crafted from premium materials and built with advanced manufacturing techniques, this system is designed to withstand harsh conditions and deliver lasting performance. Expect a bold, aggressive growl at wide-open throttle, along with an impressive gain of 10 horsepower and 12 FT-LBS of torque to all four wheels! Unmatched Design and Precision Engineering Unlike anything currently available, the APR system includes downpipes extending to the factory catalyst in the upper engine bay, making this a true full-system upgrade. We’ve minimized restrictions with smooth transitions, oversized piping, and straight-through mufflers and resonators. Constructed from mandrel-bent T304 stainless steel with a brushed finish and TIG welding throughout, this exhaust system is as durable as it is striking. Installation is hassle-free, thanks to precision-fit brackets, OEM-style slip clamps, and an included upgraded tunnel brace to accommodate the oversized piping. Inspired by RS Performance Like the RS4 and RS5, this system features a reengineered exhaust routing design. It utilizes dual 2.5” (63.5mm) downpipes to dual 2.75” (70mm) midpipes pipes merging through a cast Y-junction into a massive 3.5” (91mm) midpipe, replacing the restrictive factory dual-pipe setup. The integrated Helmholtz resonator minimizes drone through a straight-through design with a sound-canceling port, ensuring no compromise in exhaust flow. The system splits again via another cast Y into two rear, valve-controlled mufflers with sound absorption technology. These valves are fully integrated with the OEM control system, adjusting automatically to enhance sound during aggressive driving while maintaining a quieter profile during cruising. Finally, exhaust gases exit through dual cast Y-junctions into a quad 2.5” (63.5mm) system, terminating in 3.5” (91mm) lightweight, single-walled motorsport-style tips. The tips feature a polished stainless steel finish and a subtle APR logo for a refined touch. Experience the APR Difference 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.

Features:

  • 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.

Returns

Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. All items are subject to 15% restocking fee from the manufacturer.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Additional non-returnable items:
Gift cards
Downloadable software products

To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.

There are certain situations where only partial refunds are granted (if applicable)

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.

If you would like to start a return please click here

Refunds (if applicable)

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.

Late or missing refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at info@amtuning.ca.


Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.


Exchanges (if applicable)

To start an exchange, click here

Non-refundable items

The following items are non-refundable and non-returnable once purchased: oils, fuel or oil additives, filters, tuning cables, OBDeleven products, Braum seats, spark plugs, coil packs, and similar consumable, wheel spacers, wheels bolts, license plate brackets, electronic tuning components and any other product subject to discretion of AM Tuning Canada.

Other products from brands such as MHD, Bootmod3, Ecutek, Braum racing, Novitec are also non-refundable and non-returnable.

All sales of these items are final and are subject to the policies and discretion of AM Tuning. By completing a purchase, the customer acknowledges and agrees to these terms.


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