Emissions

[drmmr15]

So, I bought an '87 Supra Turbo a few weeks ago, and started tearing it apart because it does not boost. I believe I have a clogged Cat, and since the moron before me welded it in, along with the downpipe, I cant look at it. My question is, since I have not passed emissions, and putting on an aftermarket exhaust would eliminate the front Cat, should I; A) buy an aftermarket cat, cut out the old one, weld on flanges to the pipe, and put that one in to pass emissions, or B) should I spring for a new exhaust system with a high flow Cat and hope it passes emissions? I know there are more options than this, so if you have any ideas just let me know. Thanks.

Also, should I try passing emissions with a clogged Cat and no boost, or would that make things worse?