pronto,im not sure if there is an advantage at this point. i figured why have any potential backpressure issues,as the ptc will spool both 65/68 turbine wheels. tnetics says this wheel will make 35-40psi of boost.i think for most applications the 65 wheel will be more than plenty and will allow flexability in the converter area and ex housing selection depending on boost.23psi is flashing the 9.5 to 5500.