The Audi S8’s factory catback exhaust system is located in a slightly different location compared to other models. As such, the APR Adapter is required for proper fitment with the factory catback exhaust. The fit kit consists of two OEM clamps and extension pipes. The system bolts directly between the APR downpipes and factory catback pipes.
for use with:
+32-95 FT-LBS of Torque
Cast Bell Mouth Inlets
Full 76mm Stainless Steel System
APR is pleased to present the ultimate Cast Downpipe Exhaust System!
The APR Cast Downpipe Exhaust System replaces the restrictive factory catalyst cross pipes and resonators with an upgraded 76mm stainless steel mandrel-bent system, featuring port-matched cast inlets, high-flow catalysts and various other features. Expect better throttle response, more horsepower and an intoxicating exhaust note, while remaining civilized during normal daily driving. It’s the best performance upgrade for the 4.0 TFSI following the APR ECU Upgrade and it’s all designed and assembled in-house, using premium materials and world-class manufacturing techniques few can match.
The factory downpipes are less than desirable from a performance standpoint. Both pipes quickly neck down from the massive turbocharger outlet to small and resistive 60mm pipes that are kinked in many areas before twisting and dumping into catalytic converters. APR greatly improved upon this design through the use of investment-cast and port-matched downpipe inlets. Each pipe gradually reduces to the larger and straighter 76mm piping, with the hot catalyst moved further down the exhaust stream to keep under hood temperature down.
The cast inlets, piping and other components are made from the the high-nickel content, premium-grade stainless steel known as T304L. This material was chosen for its excellent corrosion resistance, strength and appearance. The castings are tumbled to smooth and de-burr any imperfections, and all piping is brushed clean before entering the CNC controlled mandrel benders. TIG welding is used at all connection points, and was chosen for its strength and appearance. Each weld is argon back purged during assembly to increase strength and consistency of the welds. The gusseted brackets are CNC laser cut and bent to provide strong mounting points to the factory mounting hardware.
|Vehicle||NAR Fuel||ROW Fuel||Max HP||Max TQ||Max HP Gain
Over APR Stage I
|Max TQ Gain
Over APR Stage I
|- Max increases are based on APR's actual measured stock values and not those reported by VAG. | RON = ROW Fuel Grades | AKI = North American (RON+MON)/2 Fuel Grades.|
|- Reported wheel figures measured using APR's AWD Dynapack and APR UK's AWD Dynojet dyno with multiple vehicles, using SAE correction and an average of multiple runs for all figures. Stage II included a high flow downpipe. Crank figures are estimated based on the measured wheel figures. Results may vary depending upon environmental conditions, vehicle, transmission, vehicle health, operating conditions, temperatures, fuel grade, dyno type, dyno setup, other variables and other modifications.|
|Audi S6/S7 (C7)||91 AKI||95 RON||575 HP||669 FT-LBS||+56 HP @ 3,850 RPM||+82 TQ @ 3,350 RPM|
|Audi S6/S7 (C7)||93 AKI||98 RON||586 HP||694 FT-LBS||+52 HP @ 3,950 RPM||+73 TQ @ 3,500 RPM|
|Audi S6/S7 (C7)||100 AKI||104 RON||602 HP||713 FT-LBS||+59 HP @ 4,050 RPM||+83 TQ @ 3,500 RPM|
|Audi S6/S7 (C7)||104 AKI||108 RON||614 HP||717 FT-LBS||+71 HP @ 4,250 RPM||+91 TQ @ 4,000 RPM|
|Audi S6/S7 (C7.5)||91 AKI||95 RON||567 HP||648 FT-LBS||+35 HP @ 3,950 RPM||+61 TQ @ 2,400 RPM|
|Audi S6/S7 (C7.5)||93 AKI||98 RON||588 HP||684 FT-LBS||+36 HP @ 3,850 RPM||+58 TQ @ 2,300 RPM|
|Audi S6/S7 (C7.5)||100 AKI||104 RON||613 HP||689 FT-LBS||+25 HP @ 4,300 RPM||+50 TQ @ 2,350 RPM|
|Audi RS6/RS7 (C7)||91 AKI||95 RON||679 HP||703 FT-LBS||+40 HP @ 4,950 RPM||+74 TQ @ 2,450 RPM|
|Audi RS6/RS7 (C7)||93 AKI||98 RON||712 HP||751 FT-LBS||+44 HP @ 5,050 RPM||+77 TQ @ 2,500 RPM|
|Audi RS6/RS7 (C7)||100 AKI||104 RON||761 HP||793 FT-LBS||+43 HP @ 4,700 RPM||+85 TQ @ 2,500 RPM|
|Audi RS6/RS7 (C7.5)||91 AKI||95 RON||687 HP||777 FT-LBS||+42 HP @ 2,700 RPM||+83 TQ @ 2.600 RPM|
|Audi RS6/RS7 (C7.5)||93 AKI||98 RON||709 HP||797 FT-LBS||+42 HP @ 2,700 RPM||+83 TQ @ 2,600 RPM|
|Audi RS6/RS7 (C7.5)||100 AKI||104 RON||730 HP||811 FT-LBS||+49 HP @ 4,950 RPM||+94 TQ @ 2,650 RPM|
|Audi RS6/RS7 (C7.5)||104 AKI||108 RON||759 HP||889 FT-LBS||+49 HP @ 2,750 RPM||+95 TQ @ 2,650 RPM|
|Audi S8||91 AKI||95 RON||672 HP||691 FT-LBS||+30 HP @ 4,700 RPM||+36 TQ @ 4,100 RPM|
|Audi S8||93 AKI||98 RON||688 HP||727 FT-LBS||+28 HP @ 4,750 RPM||+32 TQ @ 4.500 RPM|
|Audi S8||100 AKI||104 RON||710 HP||751 FT-LBS||+32 HP @ 4,200 RPM||+41 TQ @ 4,100 RPM|
In the past APR worked with other manufacturers to develop a limited range of private-label exhaust systems outside the scope of APR’s internal development and manufacturing capabilities. Understanding the limits of such a program, combined with APR’s desire to deliver higher-quality products in a timely manner with better customer support, APR invested in internalizing the program. With the release of this exhaust system and the others like it, APR is pleased to present our first systems fully designed and engineered in-house from the ground up!
Design and development begins with the use of APR’s professional grade in-house coordinate measuring machines. APR’s engineers have full access to a Romer Absolute arm with integrated laser scanner, FaroArm and Creaform 3D laser scanner for collection of special constraints surrounding the factory exhaust system. The engineers scan the vehicles and create detailed 3D maps of their design environment while designing each system in PTC Creo 3.0 CAD software.
Using APR’s in-house stereolithography 3D printer, rapid prototypes are created for fitment on the vehicle. The design is easily and quickly verified, and if necessary, changes can be made. Once adequate clearances and fitment is confirmed, especially in areas that move under load, physical quick-cast prototypes are created and fitted for final verification through real-world use.
APR’s world-class manufacturing partners from around the globe are responsible for manufacturing each component that falls outside of APR’s internal capabilities. Working closely with each manufacturer, APR’s engineers supply CAD models, materials specs, and other design specifications and work hand-in-hand with the manufacturer to develop the components. The end result is a collection of components, wholly unique to the APR name, awaiting final finishing, assembly and quality control at APR’s 78,000 square foot facility in Opelika, Alabama in the USA.
|Designed for Left Hand Drive (LHD) vehicles only. Right Hand Drive (RHD) vehicles require slight clearancing.|