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You should really read the BM3 user manual, all the answers are in there and it will help you to understand what the software does and the required modifications for each tuning level.
An intake is not required and may actually reduce power, but it might make some fun noises.
Throwing a set of plugs and coils at the car every 30-60k miles is generally a good idea.
You will be able to load a BM3 Stage 1 OTS (Off The Shelf) Map without any supporting mods (intercooler and downpipe). Stage 2 really requires both of those.
The burbles and pops are from excess gas burning in your exhaust. The factory settings will have very little impact on your catalytic converter. More aggressive burbles will shorted the life of your cat. Bangs will destroy your cat quickly. That means you won't be able to pass emissions.
Swapping for a catless downpipe allows you to have the stupid shotgun blasts, but you won't pass emissions.
My personal option is that modern pops and burbles are the equivalent to 90s fart cannon exhausts. It doesn't serve a functional purpose and is reducing the efficiency of your car. I also think catless downpipes for a daily driver is selfish when high performance cats are available. It's pay to play.
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