4 inch - 101,6mm TÜV-Downpipe for RS3 8V - TTRS 8S - DAZA

Product details:

• Reduces the peak exhaust gas temperature by up to 150°C after the turbocharger compared to the original downpipe
  
• Up to 30% less exhaust backpressure than comparable 3.5 inch downpipes
  
• Designed for up to 750PS
  
• 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 pipe / Y-pipe / downpipe
  
• 1 x stainless steel laser-sintered Y-piece for adaptation with V-band
  
• 2 x catalytic converters 400 cells for TÜV registration (only in conjunction with software)
  
• 1 x V-band ring / clamp
  
• 6 x M8 bolt and copper nut
  
• 2 x gasket for triangular flanges

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 with this pipe diameter throughout. It starts at the turbo outlet and replaces the standard pre-catalyser. Our TÜV downpipe comes with 2 x 400 cell catalytic converters, which can be used far beyond the TÜV-approved range (600 hp).

There is also a choice of 200 and 100 cells, both of which are only suitable for motorsport applications. Compared to 200-cell catalytic converters, there are no measurable or audible differences up to 750 hp, but 400 cells clean much better and last longer over the years.

The pipe diameter reduces the exhaust back pressure by up to 30% (depending on the boost pressure, the turbocharger and other peripherals) and thus massively reduces the tendency of the engine to ‘knock’ on cylinders 2 and 3 - which begins at the latest at 700bhp on 102 octane and 820bhp on E85. During our turbocharger development, we were able to determine several times that the difference between 3.5 inches (88.9 mm) and 4 inches (101.6 mm), even with a downpipe directly on the bottom of the vehicle, resulted in up to 20 hp and 25 Nm as well as a reduction in exhaust back pressure of up to 0.15 bar.

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

Any modification 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 fulfils the requirements for TÜV registration and can be registered at our premises or at one of our authorised dealers. The downpipe is not legal without this registration.