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APR C7 / C7.5 S6 / S7 4.0 TFSI Catback Exhaust System

Exhaust
Exhaust

The APR Catback Exhaust System personalizes your vehicle’s looks, sound and performance. Beautifully hand-crafted T304-stainless-steel components adorn the system with stunning TIG-welding throughout. Our straight-through brushed-finished mufflers smooth the exhaust note to a deep growl, without adding restrictions. Strong high-quality bracketry and OEM-style clamps hold the system steadily in place, making the install or removal a snap, and fitment simple, yet precise. Cast 2.75” to dual 2.5” rear splitter creates an ultra-smooth transition, steadily feeding exhaust gasses out of the system. Our cast valve housings enable the vehicle to be fitted with the factory electronic valve actuators, retaining OEM valve operation.  Finally, removable 4" polished slash-cut exhaust tips finish the system, adding a classy motorsport-inspired touch to the rear of the vehicle. Optional tip upgrades, and an optional center muffler / Center muffler delete is available.  

Quick Facts

  • T304 stainless-steel construction
  • Argon-back-purged TIG welding throughout
  • Dual 2.75" to quad 2.5" mandrel-bent brushed tubing
  • Ultra-smooth cast 2.75" to dual 2.5" splitters
  • Brushed-finished straight-through sound-absorption mufflers with an optional center muffler or straight pipes
  • Polished 4" slash-cut exhaust tips (removable and upgradable)
  • Cast valve housings and brackets for OEM electronic actuators
  • Rugged and precise mounting brackets
  • CNC bent and laser cut tunnel brace for added chassis rigidity
  • OEM style slip clamps and Torca AccuSeal T304 tip clamps
  • Direct fit to the OEM and APR Race DP exhaust systems
  • Low-profile design, suitable for lowered vehicles
  • Larger diameter piping compared to stock
  • Larger diameter tips compared to stock
  • Designed, developed, assembled and quality controlled in-house
  • Easy to install
  • Limited lifetime warranty

System Overview

Our exhaust system uses larger piping compared to the factory exhaust system, yet weighs less in the base configuration. We use dual 2.75" OD piping, which then splits to a quad 2.5" design. The factory system uses 2.375" piping . Finally, our system’s 4" exhaust tips dwarf the factory tips, giving the rear of the vehicle a sportier look. The system shown below includes the optional center muffler.

exhaust

Component Details

Mufflers

The mufflers are responsible for reducing the exhaust note and do so without adding unnecessary restrictions to the system. Each unit features two straight-through perforated tubes that are tightly wrapped with stainless steel and fiberglass material. With the valves closed, the system is tamer, but once opened, the system sounds deep, throaty and aggressive! The mufflers have a beautiful brushed finish, and are tucked high in the exhaust tunnel, making them perfect for lowered vehicles and a treat to see when looking at the vehicle from the rear.

exhaust exhaust exhaust

The optional front muffler is responsible for reducing sound volume further. This configuration is recommended for customers who have our Race DPs and want a tamer exhaust note.

exhaust exhaust exhaust

Cast Splitter

We cast the rear muffler splitters to maximize the system’s performance by keeping exhaust velocity high and back pressure low. This is accomplished by gradually splitting the system from a single 2.75” pipe to dual 2.5” pipes. The organically shaped casting allows us to make this transition gradually as to not disturb the flow of gasses.

exhaust

Exhaust Valves

Our system features two valves that allow control of the volume of the system via the factory exhaust valve actuators. In doing so, the system can go from tame to aggressive instantly! Unlike pneumatic systems, and other common valves found in the market today, our system maintains identical OEM operation all the way down to the factory valve actuation angles. Furthermore, the system is compatible with aftermarket exhaust remotes, allowing end users to manually open the system at the click of a button.

We cast the valve housings out of T304 stainless-steel. Internally the system uses CNC-machined T303 components and brass bushings, which have stood up to our extreme torture testing. All necessary hardware is welded into place and is designed to combat heat and vibration for years to come.

exhaust exhaust

Brackets

Our brackets ensure a strong and precise fit, every time. With our design, you’ll never need to worry about the brackets sagging and losing their shape over time, or the post slipping out of the hangers. The brackets are rigid, exact in their position, fit snugly in place and are made to stand the test of time.

exhaust exhaust exhaust exhaust exhaust

Tubing

We use T304 stainless steel tubing throughout. We brush and de-burr all pipes, use mandrel bending techniques to ensure the pipes keep a constant diameter throughout, and use argon-back purged TIG welding for a strong and attractive weld.

exhaust exhaust

Tips

Our polished slash-cut 4” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. We laser etch a small and discreet APR logo onto the top of each tip, and we use T304 stainless Torca AccuSeal clamps that bolt on with ease with hardware that rotates out of sight. Lastly, since the tips are removable, you can upgrade to any one of our optional tip designs at any time.

exhaust exhaust exhaust exhaust

Tunnel Brace

The factory stamped steel tunnel brace leaves little to be desired. We’ve redesigned ours to sit slightly lower in the tunnel to allow for larger exhaust tubing. As an added benefit, the CNC-bent laser-cut brace adds additional structural rigidity to the chassis!

exhaust exhaust

Clamps

Our system uses OEM-style low-profile slip clamps and T304 stainless-steel Torca AccuSeal clamps for the exhaust tips. Our clamp selection allows the system to sit high in the exhaust tunnel, as is favored by lowered vehicles, with ultimate compatibility no matter what DP you may have. The clamps make for easy swapping of the exhaust tips, and slide out of the way to make adding or removing a Race DP easy. Each connection point is strategically placed to ensure the system has minimal opportunity to rotate during install or during years of heavy driving.

exhaust exhaust

DP Compatibility

We’ve designed our system to be 100% bolt-on with the factory exhaust DP and APR Race DP.

exhaust

Sound Tests

APR Catback w/ APR Race DP

APR Catback w/ Center Muffler & APR Race DP

APR Catback w/ OEM DP

APR Catback w/ Center Muffler & OEM DP

Optional Tips

Optional 3.5" Diamond-Black Double-Walled Tips

Our polished slash-cut double-walled 3.5” exhaust tips with a diamond-black finish upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features an engraved APR logo.

Tips Tips Tips

Optional 4" Diamond-Black Double-Walled Tips

Our polished slash-cut double-walled 4” exhaust tips with a diamond-black finish upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features an engraved APR logo.

Tips Tips Tips

Optional 3.5" Polished Silver Double-Walled Tips

Our polished slash-cut double-walled 3.5” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features an engraved APR logo. Each kit is sold as a set of two tips.

Tips Tips Tips

Optional 4" Polished Silver Double-Walled Tips

Our polished slash-cut double-walled 4” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features an engraved APR logo. Each kit is sold as a set of two tips.

Tips Tips Tips

Optional 3.5" Brushed Silver Double-Walled Tips

Our brushed slash-cut double-walled 3.5” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves, demanding all the right attention in all the right places. Each tip features an engraved APR logo. Each kit is sold as a set of two tips.

Tips Tips Tips

Optional 4" Brushed Silver Double-Walled Tips

Our brushed slash-cut double-walled 4” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves, demanding all the right attention in all the right places. Each tip features an engraved APR logo. Each kit is sold as a set of two tips. Four tips are required.

Tips Tips Tips

Optional 3.5" Polished Silver Single-Walled Tips

Our polished slash-cut single-walled 3.5” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features a laser etched APR logo. Each kit is sold as a set of two tips.

Tips Tips Tips

Optional 4" Polished Silver Single-Walled Tips

Our polished slash-cut single-walled 4” exhaust tips upgrade the rear of the vehicle dramatically. The motorsport-inspired tips tuck nicely into the factory valance, gently following the valance’s curves and demanding all the right attention in all the right places. Each tip features a laser etched APR logo. Each kit is sold as a set of two tips.

Tips Tips Tips

Purchasing Information

 
Buy Now
Application Guide
System Model Generation Photo Part Price  
APR Catback Exhaust Audi S6 & S7 4.0 TFSI C7 / C7.5 Photo CBK0009$2,399.99BUY NOW
APR Catback Exhaust w/ Center Muffler Audi S6 & S7 4.0 TFSI C7 / C7.5 Photo CBK0011$2,599.99BUY NOW
Optional - Center Muffler Delete Audi S6 & S7 4.0 TFSI C7 / C7.5 Photo CBK0025$499.99BUY NOW
Optional - Center Muffler Audi S6 & S7 4.0 TFSI C7 / C7.5 Photo CBK0023$699.99BUY NOW
Exhaust Valve Extension Harness (Required for C7.5 / Facelift Vehicles) Audi S6 & S7 4.0 TFSI C7.5 Photo RS100004$29.99BUY NOW

The catback exhaust system includes 4 tips as pictured above. The tips below are optional upgrades or replacements.

Tip Upgrades
Style Size Color Notes Photo Part Price  
APR Slash-Cut Double-Walled 3.5" Polished Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0006$124.99BUY NOW
APR Slash-Cut Double-Walled 4.0" Polished Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0001$154.99BUY NOW
APR Slash-Cut Double-Walled 3.5" Brushed Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0007$149.99BUY NOW
APR Slash-Cut Double-Walled 4.0" Brushed Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0002$184.99BUY NOW
APR Slash-Cut Double-Walled 3.5" Diamond Black Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0008$149.99BUY NOW
APR Slash-Cut Double-Walled 4.0" Diamond Black Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0003$184.99BUY NOW
APR Slash-Cut Single-Walled 3.5" Polished Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0005$74.99BUY NOW
APR Slash-Cut Single-Walled 4.0" Polished Silver Set of 2 Tips - 4 Tips Required - (Buy 2 Sets) Photo TPK0004$99.99BUY NOW

warningWARNING: Cancer and Reproductive Harm. For a list of APR part numbers associated chemicals, go to https://www.goapr.com/prop65/. For more information, go to www.P65Warnings.ca.gov.

APR Tuned

Phone: (800) 680-7921 Local Phone: +1 (334) 502-5181 Fax: (334) 502-5180 Address: APR LLC, 4800 US HWY 280 West, Opelika, AL 36801

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Notice: Products that affect emissions and do not carry a California Air Resources Board Executive Order are not for sale in California, USA. While we try to keep everything current, APR LLC is not responsible for errors in pricing on this web site. All prices are in USD and are applicable to the United States of America only.
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