Hello Audizine,

I am replacing my clogged catalytic converter a bosal direct fit replacement for my 1997 Audi Quattro 2.8/

the problem i have run into is that the clogged cat has a concave opening where it bolts into the engine. ( see http://i16.photobucket.com/albums/b2...garagecopy.jpg)

the replacement is flat (https://www.qcsonline.net/bosalb2b/p...s/01200105.GIF) and thus does not fit tightly when bolted on. does anyone have any suggestions on what I can do? The bosal part is supposed to be a direct fit.