Stay away from universal . Get a proper muffler with real flanges and a proper tail pipe and you can just bolt it on as VW intended . 
       Buy it from a list vendor or local flaps . Get the gaskets and bolts and put the cheese back in the cabinet  . 
       Rarely is cheap the best option . Remember you can have it "Cheap  - Quick - Quality  " but of those 3 you only get 2 at the same time .

-Stacy