hey thanks to tigerintegra i am gonna get a carsound 2.25 high flow cat but i am gonna have them put the o2 bung on and flanges so should i make them do the o2 bung front and then a 2 bolt flange and 3 bolt flange so is the dc integra (94) ls is that right to get the o2 bung front and then is it 2 bolt front and 3 bolt back or is it 3 bolt front and 2 bolt back let me know thanks peace