De-Cat downpipe experiences

[Lots_Of_Trouble]

Im looking at buying the Aerie Performance or GRP De-Cat downpipe.

My questions are:
Has anyone installed this and not the rest of the exhaust system?

If so,what are differences in performance etc?

And also,will it be permissible for a track day,i.e not too loud?

 

[Milk242]

Lots of people do this, it’s called the third cat delete if you search the forum. From what I can tell, people usually pair the third cat delete with a valve controller.