4 inch - 101,6mm 4 inch TÜV-Downpipe for RS3, TTRS, RSQ3 - OPF - DNW

Product details:

Catalytic converters in combination with OPF modules under the vehicle
Up to 30% less exhaust back pressure than comparable 3.5 inch downpipes
Designed for up to 650 hp 
Continuous 4 inch 101.6mm to 2 x 3 inch 76mm 
Manufactured in 1.4301 stainless steel
1:1 interchangeable with standard downpipe
Suitable for all 2.5 TFSI 400PS models

Scope of delivery: 

• 1 x 4 inch / 101.6mm exhaust tailpipe / Y-pipe / downpipe
  
• 1 x stainless steel laser-sintered Y-piece for adaptation with V-band
  
• 2 x catalytic converters 400 cells & 2 x OPF modules
  
• 1 x V-band ring / clamp
  
• 6 x M8 screw and copper nut
  
• 2 x gasket for triangular flanges
  

Suitable for: 

• Audi RS3 8V (2018-2020)
• RS3 8Y (2021-202X)
• RS Q3 (2019-2020)
• TTRS 8S (2020-2023)

Product description:
The HPerformance 4 inch 101.6mm downpipe comes directly from the development of our 1/4 mile vehicle into series production. It is the first downpipe in the world to be built in this pipe diameter throughout. It starts at the turbo outlet and replaces the standard pre-catalytic converter. Our TÜV downpipe comes with 2 x 400 cell catalytic converters, which can be used far beyond the TÜV-approved range (600 hp) and also uses OPF filters. We also install this variant in the approved performance level with 600 hp in all OPF models. 

The downpipe goes in exchange for the standard downpipe. Especially with the OPF models, there is a clearly noticeable difference between 3.5 inch / 88.9mm and 4 inch / 101.6mm in exhaust back pressure and temperature recordings. On average, the exhaust backpressure of the 4-inch OPF downpipe is another 119 millibars (mbar) below the level of a 3.5-inch variant. The exhaust gas temperature under continuous load with the 4-inch variant is on average 15 °C below the 3.5-inch variant.

These advantages are now also available for the road, as the downpipe has been made ready for series production. 

Any change to catalytic converters (replacement, change of cells or size - different from the original state) requires a software adaptation of the engine control unit. With our remote flash solution, we also offer suitable tuning for the DNW 2.5 TFSI.

Important: Our so-called TÜV catalytic converter / TÜV downpipe is supplied without TÜV documentation. In combination with our software and hardware, it fulfills the requirements for TÜV registration and can be registered at our premises or at one of our authorized dealers. The downpipe is not legal without this registration.

Please note:
In accordance with our General Terms and Conditions, we would like to expressly point out once again that all articles that are not expressly marked with a TÜV / EC approval do not have approval in the area of the StVo. These articles must therefore be type-approved by the user before they can be used on public roads. Otherwise, these products must be used in racing.