All,
If you want to purchase a "nice" Catalytic Converter for your MKII, Random Tech supposedly makes one for our applications.
Also, make sure you are ordering the correct size!!!!!!!!!!! In North America, 82 - 84's use a 17" length Cat, the 85 - 86's use a 12" cat. Dean Anderson got these numbers when he did our original GP's on the Brullen Cat-Back Exhaust & his MKII was the test-fit car.