hi.
Ive just bought a 2002 mini one and want to do it up on a budget, so my question is can i change my standard exhaust with one from a cooper s. i don't mind a bit of work but don't want to redesign the whole car.
cheers rob

Yes it can be done, there are a few threads on here giving the details.
More:
http://www.mini2.com/forum/first-generation-mini-exterior/175770-mini-cooper-s-exhaust.html

http://www.mini2.com/forum/first-generation-mini-one/95802-mini-cooper-s-exaust-my-one.html

http://www.mini2.com/forum/first-generation-mini-one/162033-cooper-s-exhaust-one.html

Mini Cooper S One-Ball Exhaust upgrade | Car Reviews and news at CarReview.com (http://reviews.carreview.com/mini-cooper-s-one-ball-exhaust-upgrade)

cheers it makes interesting reading and does not look to hard.