Pay in installments of $250.00 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 17 - Aug 22
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
APR CBK0012 - Catback Exhaust System - S4 / S5 (B9)Fits Audi S4 18 25, S5 18 25 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
Fits Audi S4 18-25, S5 18-25
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.
Specs
| Bending | Mandrel |
|---|---|
| Brackets | Precise |
| Brand | APR |
| Category | Exhaust |
| Clamp Style | Slip Clamp |
| Clamps Included | Yes |
| Emission Code | 5 |
| Exhaust Tip Color | Polished |
| Exit Tube Diameter | 2.5 IN |
| Material | T304 Stainless Steel |
| Muffler Finish | Brushed |
| Muffler Style | Sound Absorption, Helmholtz |
| Product Type | Exhausts (Catback Systems) |
| Sub Category | Exhaust and Tail Pipes |
| Tip Count | 4 |
| Tip Diameter | 3.5 IN |
| Tip Finish | Carbon Fiber with Brushed Inlay |
| Tips Removable | Yes |
| Tube Connection | Butt Joint |
| Tube Diameter | 2.5 IN |
| 2.75 IN | |
| 3.5 IN | |
| Tube Finish | Brushed |
| Valve Actuation | OEM |
| Valves | Yes |
| Welding | TIG |
| UPC | 810009932550 |
| Part Number | CBK0012 |
Emissions
This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
Tech Resources
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 27 reviews
Sort
Product Reviews
★★★★★ 5
Great addition to my collection
Format: Hardcover, Format: Hardcover
Came great as I hoped and looking forward to the Vol. 4 reprint in November (the Green Arrow nearby was another purchase i made that got packed together)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
★★★★★ 5
A true Meghan Quinn masterpiece!! 😂✨
Format: Audiobook
🎧 Rules for the Summer by Meghan Quinn
Narrated by Stella Hunter, Shane East, Cassandra Medcalf & Gary Furlong
A true Meghan Quinn masterpiece!! 😂✨
I laughed my a** off from beginning to end, and the narration honestly could not have been more perfect. Every narrator absolutely nailed their character and brought all the chaotic, hilarious, emotional, and spicy moments to life so well that I never wanted this audiobook to end. And the accents?! Absolute chef’s kiss 🤌🔥 They made the listening experience even more fun and immersive.
Theo and Henley were such a fun couple to follow. The banter, chemistry, tension, and absolute ridiculousness between them had me smiling nonstop. And Aunt Kitty and Rupert? ICONIC. Honestly, they stole so many scenes for me and added even more humor and heart to the story.
This book had me laughing out loud one minute and fanning myself the next 🥵😂 The spice was definitely A LOT… but honestly, are we even surprised when it comes to a Meghan Quinn book? She always delivers the perfect mix of humor, romance, chaos, and steam.
The audiobook production was phenomenal. Stella Hunter, Shane East, Cassandra Medcalf, and Gary Furlong made this story feel so immersive and entertaining. Their performances elevated an already fantastic story into one of those audiobooks you just never want to stop listening to.
Absolutely loved this story and highly recommend the audiobook version!
Happy Reading/Listening 🎧📚
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 4
Perfectly hilarious summer romcom
Format: Paperback
Rules For The Summer by Meghan Quinn is a romcom you’ll want to pack in your bag to read by the pool or beach this summer. You also can’t go wrong with the audiobook narrated in duet by Stella Hunter and Shane East with Melissa Metcalf and Gary Furlong as the side characters. They were perfectly cast and had me laughing out loud as the characters found themselves in even more ridiculous situations.
The dynamic between Theo and Renley was so entertaining. I loved their game of Truth or Dare. Once they started falling for the other, they did not hold back on their spicy times.
Not only do we get the delicious tension and chemistry between Theo and Renley, but we also get a front row seat to Theo and Rupert’s friendship and their amazing banter as well as the amusing dynamic between Rupert and Renley’s aunt.
* Mix up Meet Cute
* Small Town Romance
* Neighbors
* Forced Proximity
* A list of rules
* Opposites Attract
* He Falls First
Pick this one up if you are looking for a fun, light-hearted romcom with plenty of spice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
★★★★★ 3
Cute story, over-the-top narration (in a bad way)
Format: Audiobook
3.5/5 This was a fun, light weekend read with some great buddy humor, a worlds-collide storyline, and the whimsical side characters that Quinn does so well. The pacing felt a little uneven at times, and I was disappointed to see the story was light on comeuppance in the end. One thing I really struggled with about the heroine was how frequently this ostensibly strong, gritty character just quit when things got difficult. If she quit everything hard until a man was there to push her not to, how can she be surprised no one took her seriously??
The thing I struggled with the most, however, was in the audio version of this book. I really love Shane East and was glad to see him narrating another Quinn book. He's so good at the "over the top" joyous man-child character, and he did this one justice. HOWEVER, how he did the intimate scenes in this book was way way way way way too over-the-top. It gave seventies porn vibes-level cheese to me, and I wound up skipping most of them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
★★★★★ 5
⭐️⭐️⭐️⭐️⭐️
Format: Audiobook
Rules for the Summer by Meghan Quinn was the perfect mix of hilarious, emotional, and ridiculously swoony. Meghan Quinn never misses when it comes to romantic comedy, and this book had me smiling from beginning to end.
The banter between the characters was absolute perfection — witty, flirty, and laugh-out-loud funny. But underneath all the humor was a genuinely heartfelt story filled with chemistry, tension, vulnerability, and so much charm. The slow burn was done so well, and every interaction made me fall harder for the characters.
What I loved most was how effortlessly Meghan Quinn balanced comedy with emotional depth. One minute I was laughing out loud, and the next my heart was aching for them. The romance felt authentic, addictive, and completely unforgettable.
If you love summer romance, amazing chemistry, hilarious dialogue, and characters you can’t stop thinking about, Rules for the Summer is an absolute must-read. Another Meghan Quinn favorite for
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
recommand products
Debt-Free U
112.00
Secret Keeper
59.00
No More Tears (2LP) & Black Rain (2LP) & Bark At The Moon (40Th Anniversary) (Translucent Cobalt Blue LP Vinyl) & Diary Of A Madman (180G)
134.05
Bodies (I) & Sing The Sorrow (2LP/45RPM) & Black Sails In The Sunset & Art Of Drowning
122.06
Peur Sur La Ville (Gatefold Sleeve Designed By Eric Adrian Lee) & L’Ultimo Treno Della Notte (Yellow LP Vinyl) & Senza Sapere Niente Di Lei (Yellow LP Vinyl) & Morricone Segreto Songbook (1962-1973) (2LP)
150.52