I agree with Pete, that an aftermarket pipe is not worth the money for you.
Another alternative that is cheaper than a new aftermarket pipe is a used pipe from a '99. It is supposed to be a little better for low end power than your '97.
I had a '99 I bought from a district champ enduro and cross country racer, and he used the stock pipe, and felt it was better for offroad than the the aftermarket pipes.
For all around trail performance, you will get much more benefit from revalving the suspension and getting a steering damper, IMO. Factory Connection did a great job on the suspension on my '99.