I was pretty happy with the gains I got with my old 96 talon. Basically the same setup as you got and it did pick up noticeably.
The apexi one probably fits the best and is gonna bolt up to the stock housing the nicest. That being said, I ran a megan (cheap as hell, but its been pretty durable). It did't fit quite as nice, the bracket hangin off the block had to be removed (bout 5 minutes of work) but once it was on there it was nice. It has a huge flange and I had to adjust it so it wouldnt leak but it's 3 in all the way back.
Like the others said the mod bug is easy to catch, before you know it there will be a scm61 hangin there and a laptop on the passenger's seat tuning the car
. And your gonna wonder what happened to all your money.
Threaded Mode