ok im trying to figure out what i should do i got a 3 inch hks downpipe and exhaust but cant figure out what to put in place of the catilytc converter i live in texas were i have no emissions but i dont want to weld it all together so has anyone ran into this before if so can you please help me find out how to set this up id appreciate it.

p.s. this is what im doing

 

check out corksport, i think they have a cat replacement pipe that is the same length.