i traded my CTR header yesterday for a DC sport 4-1. right now i'm running my stock header cuz i need to get my car smogged and i was going to sell the DC or trade it plus cash for a ITR header. should i install it on my car? does anyone have this header? is it worth installing it on my car? will it fit my stock cat(with or without modification)? any input you all can give me would be great.