Right now I have a tko 2.5in and stock dp. I was thinking of buying a dp but i'm worried i'll fail emissions with no cats. Also, i'm worried about noise. I know a dp is a great mod for our cars but will I pass emissions? Also, how much of a hassle is it to replace the stock dp on to pass emissions if a new dp will make me fail? Mods I have are CT27, TKO 2.5, Greddy IC, Intake, NGK Coppers at .028, MBC @ 15psi. Will a dp help me (I don't plan on upgrading fuel or ecu)?