WeeG, I'm very impressed with the work you've done to your Bumblebee - I've read the entire thread.. pretty epic stuff!
I do have some questions for you though..
1) I may have missed this in your thread, but do you have a dump valve / spacer fitted? If not, why not?
2) What is an "RS4 Valve" - what does it do and how is it better? Is it a direct replacement or does it need software as well?
3) When you had your full stainless system fitted, did you get any emissions fault / engine light come on due to the oxygen / flow sensors? I know the Revo map takes care of any of these anyway, but I was thinking of getting a full system for my Cupra but can't afford the Revo map as well - wondering if I can get away with just the exhaust for now as I wouldn't want my dash lit up
Cheers pal! Look forward to seeing other stuff you're going to do.... You must surely be thinking about the GT3071R upgrade??