BCS 3" Downpipe With 100 Cell Hi-Flow Cat & Link Pipe To Fit OEM System - Audi A3/S3 8P inc Sportback (Quattro Models Only)

BCS 3" Downpipe With 100 Cell Hi-Flow Cat & Link Pipe To Fit OEM System - Audi A3/S3 8P inc Sportback (Quattro Models Only)

Please choose from the dropdowns which options you require.

If ordering from outside the UK please contact us for shipping information

The Powervalve road legal 100 cell cat is the ideal hardware upgrade when considering a power increase on the 2.0 TFSi engine. In addition, you will notice an audible uplift in the sound producing a nice sporty tone in the vehicle under acceleration.

The Powervalve downpipe and 100 cell cat come with a connecting pipe to allow you to connect to the OEM cat-back system with the minimum of fuss. If you decide to upgrade to the full turbo-back system at a later stage then the connecting pipe simply swaps out again to allow the installation with a minimum of fuss.

The dimensions employed on our unique cat will allow a gas flow equivalent to a cat delete pipe whilst remaining completely MOT and road legal.

The Data supporting the product is shown below

  Original Equipment Cat 

  Description                         Limits                          Actual Value

    Fast Idle Test

• Engine Speed               2500 - 3000 rpm                 
• Co                                  < 0.20%                            0.00%  PASS              
• HC                                  < 200 ppm                       1ppm   PASS
• Lambda                         0.97 - 1.03                        1ppm   PASS

   Natural Idle Test

• Engine Speed              450 - 1500 rpm                 
• Co                                  < 0.30%                            0.00%  PASS              

Powervalve 100 Cell Cat 

 Fast Idle Test

• Engine Speed               2500 - 3000 rpm                 
• Co                                  < 0.20%                            0.00%  PASS              
• HC                                  < 200 ppm                       4ppm   PASS
• Lambda                         0.97 - 1.03                        1ppm   PASS

   Natural Idle Test

• Engine Speed              450 - 1500 rpm                 
• Co                                  < 0.30%                            0.00%  PASS     

The primary use for the Powervalve 100 cell cat is a public road or track.

As with virtually all of the TFSi engined vehicles, there is very little performance gain to be had from the cat-back system on its own, due to the incredibly restrictive downpipe and twin OEM cats. However, by opting for our unique down pipe and high flow cat the power potential will massively increase, firstly with an initial 22bhp kinetic, and then once mapped all the way up to a stage 3 the following figures are achievable (along with suitable additional hardware...)

The TFSi K04-based BYD BWJ BHZ CDL Performance guide

• Stage 2  custom remap                                                  340 hp        340 lbft
• Stage 2+ custom remap                                                 380 hp        400 lbft
• Stage 3 k04 0r k03 hybrid custom remap                     550 hp        550 lbft

(all Performance figures are based on levels achieved by R-Tech Performance)

If you require more power from your S3 we recommend the 76mm (up to 400 bhp) or 90mm (400 bhp+) down pipe to go with this system.

The images below show the comparison between the 76mm and 90mm down pipe options we offer.

Please call for details...

We recommend a new turbo to the down pipe gasket when performing the installation, as well as new turbo to downpipe studs and nuts