what kind of options are there for upgrading the exhaust on a 2000 528i...any :help would be appreciated.

I think the most common mods are to the stock exhaust... deleting the Y resonators, extra muffler, etc. I know a lot of people also like doing custom piping with magnaflow mufflers. I think Supersprint makes a bolt-on pipe for the 528... not certain though.

http://www.hmsmotorsport.com/store/supersprint/e39-exh/e39-6cyl-exh

http://www.autowerks.com/xcart/customer/product.php?productid=21927&cat=255#details

got a remus on my 528i check my threads for more info