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As for volume and how sound quality goes the catback is going to control that. Go to youtube and listen to some sound clips, this will give you a good idea. Also, check some reviews and such on here for sound descriptions. Some will be loud but raspy and some will be mild but deep and some will be a combination of those. If you just want loud replace the stock muffler with a Berk Technologies muffler delete or the like. Use that as a reference to look for others if you dont like that kind.
Frontpipe and overpipe will add to the volume just a little but if you do get one without a resonator you will have lots of drone in the cabin. Some people dont care about this, I do.
Header will mostly change the sound type and not really volume. Equal length will stay will the sound you have now. A Unequal length will give you the boxer rumble that you here with WRX and STI.
Keep in mind that as you delete mufflers, resonators, and cats you will also be adding drone and rasp. Drone can be very irritating when at cruising speeds and sometimes cause head aches.
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