This is a 3" inlet and outlet CAT for use in any TDI. It provides better flow than the stock CAT while reducing particulates and exhaust smell. This CAT is ideal for use with a 3" downpipe. It's possible to use this CAT with the downpipe and no muffler (where local laws allow) and maintain a reasonable exhaust noise level.
For use with pre-2007 vehicles only! Not for cars equipped with Diesel Particulate Filters! This converter is not CARB certified for use in California.