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.