Just wondering what is the smallest cat available for our cars? I need them small to fit them RIGHT after the collectors on the LT's

 

Random Technology makes the smallest cats that I know of. Might want to check their sight or give them a call for your application. I do know that they make a 3 inch in and out cat that is very small but I think they are kind of pricey. But you do get what you pay for and they do flow well. Might want to also check with Dynatech. They are making a new cat that is pretty small and is also 3 inch in and out. They are advertised in Jeg's.
Hope this helps.

 

I saw some weird "cats" I from mufflex that slipped into the ypipe and were just a cylinder with wires in it. This was on the new coated LS1 setups from jethot, but I would think it could work or will be offered soon for LT1s.