3rd gen exhaust question

I have an 89 firebird 305 with a single catalytic convert and i just bought a flowmaster cat back system i was wondering what brand converter should i get and do i need the air tube to pass ohio emissions tests.

If you go to your local auto Zone they have the mini cats with the air tube there it is judt mashed closed ,,for about 70 bucks and if it has the air tube hooked up then leave it hooked up if you can get the new cat with the air tube in it