Downpipe alone will change the sound plenty.. Do it first and move on from there.
I also am not a fan of the single muffler AFE catback design and prefer dual or suitcase setups like HKS,Apexi, Akrapovic...etc
Burbles present on stock map and not on the OTS stage 1
Better reach out to their tech support
I had BM3 and the burble functionality did not work properly, altering burble sliders (duration, aggressiveness..etc) sometimes did nothing and in one occasion completely removed burbles for me...
Had my Ecutek laying around for a month or so waiting for more car parts..
Installed a Pure turbo upgrade recently and went through the tuning process with Speedindustry and @Paynful Jeff Payn . More complicated than BM3 at first but then you get the hang of it and all seems very easy esp data...