Here's the pipe on the Kinetic moped. It's a 2 piece pipe with a cat in it. Just unbolt the pipe and pull out the cat. Tomos can do the same thing. See Attachment.
#47 03543270 inlet tube assembly
#51 03444660 Silencer assembly with baffle
#62 13225090 catalytic converter dia 33 x 60 duly flanged