Local radiator shop's will be able to clean and seal for you.The one hear charges me $80.

check this out also
http://www.por15.com/s.nl;jsessionid=ac112b1b1f430976205ccc974a9dba41bd4bd1201abd.e3eTaxmKbNaNe3yLaNiRbxqNe6fznA5Pp7ftolbGmkTy?sc=2&category=180


Gangster whites and straight pipes.....