Hey guys, got a question that searching has not turned up a specific answer.

I got a b18c type r motor in my 2000 ex, and looking to get the jdm itr 4-1 header, but read that its longer then typical b motor headers. Just want to know, as far as carsound cats, which part number do i need. its gotta have the bung for the o2 sensor sense its obd2. needs to reach a greddy evo exhaust. before it would connect to the stock cat with the d16y8 fine if that would help.

i know that i should get the universal fit ones but typically what is the length the cat needs to be so i can take it to a muffler shop

also any suggestion for different brand cats? like random technology?