Dansk Premuffler emissions

[pcheplick]

My car is a stock '86 Carrera w/ 63K miles and runs great. I assumed for obvious reasons that when I swapped out my cat. with the Dansk stainless premuffer that my exhaust emissions would be noticably more than with the cat. But they were so obnoxious, to the point where I had to put the cat back on. Is this typical? I've not noticed this with other cars I've seen / been around that had this same modification. Thanks,
PC