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What videos are you referring too? As far as exhaust is concerned there's 3 things that will make it louder: muffler delete, resonator delete, catless downpipe. There's a video on YouTube from GSR technik with an orange 228i straightpiped so you can get an idea of what it would sound like as loud as possible.
Personally I don't like the sound of the straight pipe, it's just too loud and on the N20 it sounds like a lawnmower. Personally I really like the sound of just muffler delete from what I've seen on YouTube. You can also modfiy the muffler by removing some of the sound deadening material and reattaching it if you want a more reserved yet louder sound.
Getting the downpipe will let you hear the burbles and crackles but you'll get a check engine light unless you have a tune or you code it out. Catless DP will give you about a 10-15HP bump, and as long as the job is down well you won't get any nasty smell.
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