drummer

Hi,

I'm currently looking for a catalytic converter but I don't know which one to buy.
I'm driving a 88 GMC Sierra C1500 Stepside, 383 cui stroker. Right now, there is no cat installed at all.
I only have a Flowmaster super 44 muffler, which I really like, but unfortunately I'm driving that truck in Germany an they want me to install a cat.
At the moment, I'm in the US for 4 month due to work purposes and that's why I'd like to buy a cat over here.
The cat should be as short as possible (2.5 inch in & out) because I don't have that much space between the cut-out and the super 44 and I'm not willing to remodel the whole exhaust system only for adding a cat.
Here are three options, I found at summitracing, but there are hundrets more to choose from:

http://www.summitracing.com/parts/mpe-53006/overview/
http://www.summitracing.com/parts/psm-80-0026/overview/
http://www.summitracing.com/parts/psm-80-0016/overview/

So, which one would you recommend?

Thanks a lot!
Lukas