Indeed, there are no other exhaust differences, I guess the combination of the tune, IE intake, APR turbo inlet and eurocode throttle body contributes to the overall sound difference.
Firstly, I want to thank Nige for his fantastic customer service. So I’ve just completed installation of the BCS downpipe together with other go fast mods and a stage 2 MRC custom tune. The results are simply amazing (sounds like a V10) and the pops are 60% more pronounced.
The wastegate noise...
Yes, JB4 is a performance tuning box. One of the best I tested by far.
I have it installed on my Audi S3, Golf R and Clubsport, and just remove it before taking the cars to dealer. It has never been detected as it does not leave any trace in the main ICU.
I have used 42 drat design o2 sensor on my decat Golf Clubsport, and it's working fine. However, not sure if it would do the same for RS3, as I can't find any reviews.
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