Need your guys' help

Alright this girl is selling her Si with a B16a2 in it. She says when it first starts up while it is cold, there is a slight noise at the bottom of the engine. I don't know what kind of noise (waiting on the response). Any ideas though on what it could be? It is a '00 Honda Civic Si. Needs a new hood, front bumper, paint job and this problem fixed. Do you guys think that is worth $2500? Thanks for the help in advanced brothers 
