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yes you can achieve those goals but being an auto the minor power gains will be quite muted

using 2 of this style of muffler with 2.5" piping
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It may improve 1or 2 horsepower and torque but nothing major

Yes you can achieve that deeper sound but you need to use 2 mufflers and not just a resonator and cannon or for sure it sounds like...

Magnaflow,Lukey

or you can look to japanese brands but the price will be more

Yeah I know quite a few gone there. Since its a standard car and not performance they will just do a basic sports exhaust,its mainly for a bit of sound and not going to gain much power

They would...

Dandy are pretty good,I wouldnt worry too much