Where can i find a picture and/or instruction for a catalytic converter for an audi 2002 a6 Quad 3.0L?

Hello I been trying to find a good diagram and picture of exactly how a CataConverter looks like for an Audi a6 3.0L Quad, and is it easy to replace them? Also if anyone has a good link showing how you would remove and replace one i would really appreciate it.Where can i find a picture and/or instruction for a catalytic converter for an audi 2002 a6 Quad 3.0L?Can you cut and weld metal piping? If not, take it to a shop.Where can i find a picture and/or instruction for a catalytic converter for an audi 2002 a6 Quad 3.0L?I can fax you a picture / exploded view if you need