You need to go with 2.25 or 2.5" piping. No reason for 3" on a N/A car and you won't be as 'quiet' with that size.

Sound != power. :eh:
I can run open header and be loud as fawk, but be slower than when I have my exhaust on there. You have to realize that with a N/A motor, you need resistance from the exhaust to build up back pressure. This gives you more power at the low end. By opening it all the way up, you will be losing power.. not gaining.

Flowmaster = domestic

Get a Greddy Evo or Apexi WS or RS*R. They're clean, quiet and tasteful exhausts.

Finally, you have a header (no 's' - singular) on your car. There are MANY MANY different headers available. Most often DC Sports is the most 'bang-for-the-buck' and they're well constructed.

If you want some pricing on these parts (except RS*R), PM me with what you want and include your zip so I can get shipping.

HIH