I like the sound of headers on any engine. If it's going to remain stock, keep it simple and fairly quiet, obnoxiously loud will get old fast. I like the sound of flowmasters, but wanted to be different for mine. I just built my whole exhaust, and I like the sound. I was trying some crazy things, but the sound turned out great, quiet in the car when cruising, but has a nice bark when you get on it.
You can see how I built it and how it sounds here:
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Good Luck,
James