found a cat in my exhaust!

i had assumed that aftermarket cans ran without a catalytic converter, so i was suprised when i took off one of my cans to find one in there, i have akro evo slip on (they cam fitted to my bike, (07). i've now pulled both out of each can.

i did a little search to see if it's ok to run without them but didn't find anything conclusive. they look very restrictive so they'll stay out unless anyone know's of a good reason to put them back, or a bad reason to have them out?

also i found a topic, which mentioned there may be different maps for different akros, (05/06 non cat) (07-on, with cat). i'm running a MH airbox, akro evo map with tune ecu which i'm sure is ok but wondered if anyone knows if it's better to have them in or not?

Just leave them out!
When you have cats you shoud not disable sas as that kills them.

I have an 07 SDR with Akra Evo's and the cats have never been in. Dont think you will do any harm and you may do a little bit of good fookin them off.

sas has been done too so good to know they should be out, thanks for the replies