No ofenese but u have no idea what u are doing... A if u have 440's in there..as stated above the stock ecu won't run it. B. u are running a missing link and FMU.. stop BSing around ditch that $h!T and go get the right stuff, but then again its your car do what u want.. but u are asking for a blowen motor.. and putting the stock cat back on won't cause issues just make less power and honestly is the last of your concern at this point.