:dienewbie Prepare for the flames. Im typically nice in response to alot of questions that have already been answered. Your going to be told to search and thats exactly what youll have to do. There are so many exhaust choices it would take alot of typing to discuss them all. Check out the sticky in the tech section, you can probaly find out alot of info there. As for power gains and sound, there are a few dynos and sound clips or videos floating around on the forums. Just search.
Edit: BTW Keep an eye on the southeast forum. Were trying to put together a Supra club and organize meets every so often. Feel free to PM me with any questions.