how much is it to repair an exhaust leak of anykind? on 1999 BMW 740iL

Interested in buying a 1999 BMW 740il for 2500 and they say it runs good with a smooth shifting transmission but has an exhaust leak somewhere. How much does that cost to get fixed if it was anywhere?

Asked by for the 1999 BMW 740iL
it depends were its leaking,it could be a minor cost or a very high price. ask the seller if you can have it looked at prior to purchase