Somebody correct me if I'm wrong, but I think 97 and older 2.3L headers will work on a 98-01 2.5L. Both engines are Lima engines...so I think they'll(it'll) work. I have no hands on with them, other than my buddy has headers on his 2.3L.
stock exhaust was a header for 2.3 95-97 from what i've seen. They'll fit the 2.5. The 2.5 is just a stroked version of the 2.3l. You can get them off ebay for like 100. maybe even craigslist or junkyard for less.