I was wondering what the factory compression specs are on the 12a, and might as well throw in the 13b also.

I have 110 on both rotors @ 140,000mi, which IMO is great (85 GS).

 

Yep those are perfect numbers. Not sure what the 13B is, I would assume about the same. I think even about 90 on both rotors is still good

 

so do you think it would be safe to gut the cat on it? I have an RB header and what looks to be a cheap muffler (slightly restrictive). I don't want to blow it up..

 

That depends, Do you have a full size pic of your avatar? J/k you could do that but a cat replacement pipe would probably be the better answer. That way if you get tired of smelling like gas you could always put the cat back on. Do you still have your emissions equipment, i.e. rats nest?

 

all emissions are gone. I went ahead and cut the pipe anyway, turns out it was already gutted. I took it to the shop and they're welding in a replacement pipe