I'm having these headers installed and the shop called and told me there is no use for a high flow catalytic converter which I bought. That my Eclipse (GT 2002) has 3 pre-cats I believe he said and the headers get rid of all of them and that I'm going to get this check engine warning light etc. There is something not right here. Doesn't the hight flow cat I bought take care of this warning light?? What am I missing here? Any help would be greatly appreciated!