i need someone to enlighten me as to what kind of an exhaust setup i need once my b series is in my ek lemme know if im correct

teg header will line up to the stock exhaust?
or do i need to make some pipes?
do i need teg exhaust all the way back?
or do i use a cat/mid/axleback made for a civic

if i use a high flow cat will i throw "check engine"

ps. anyone got any itr pistons