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To answer your #9 question.. It is worth it on my opinion. A couple reasons:

1) its still much cheaper than a borla/corsa catback and we KNOW you will be getting that FAST! So save some money.

2) you get the butterfly which during a road trip you can cut the noise levels way down by switching the mode you are driving in.

3) while catback is a joke to install, car comes with it installed thus less time to do something and you can tackle installing something else :P (saves time, time is money my friend!)

4) Sound is fantastic for stock, it'll keep you satisfied till companies release their own products which will take a month or two I would assume, at least.

5) quad tip, nuff said.