lets use correct grammar from now on please...its a lot easier to read without us having to think...and it also helps you not look like a fool
Lets start out by asking what you plan on doing with the car? How extreme of a build, if any? Boost or not? Daily driver or weekend fun?
All those will determine the size of piping that you'll wanna use.
After that it comes down to quality and sound (if applicable). I recommend anything stainless steel as it will hold up against the elements and look nice while doing it.
I'll leave it at that. Please use the search feature, because this topic has been discussed to death. However, I'll leave the thread open because its kinda new to see an EP si thread here.
Posts on exhausts for EP SI's will remain...all others will be severely beaten to within an inch of their life...then deleted
(seriously....no "I have this on my 95 dx and its mad tite y0")