To be honest, from your post, I'm going to guess that any HFC/CBE combo is going to be too loud for you.
While adding dB notes to each brand of exhaust in the sticky would be helpful, most of your questions can simply be asked or answered from videos.
My best guess for people that don't want a noisey exhaust, but want gains, is to go with the HFC first. They don't add a lot of volume at all, but can drastically improve the tone of the stock exhaust. Unfortunately, the CBE's I've heard in person (FI and BERK) both add quite a bit of volume (but sound glorious!!!!)
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