Catted downpipes?
 

Is there any other catted downpipes? other than COBB?

search a bit

i believe cobb and cpe have the only catted downpipes, these are also a downpipe and test/race pipe in one. there is also an atp catted downpipe out there or was, not too sure, someone correct me. other companies make catless downpipes and provide an option of a catted test/race pipe, but these pieces come separate.

ultimate-racing.com

just google mazdaspeed3/6 catted downpipe, problem mysteriously solved.