If I purchase a PSE take off exhaust, is it possible to purchase the wiring separately? I may have located one and need to know before I move forward . This exhaust is off a new car before delivery. Thanks for your help. I Want the PSE for the ability to change between the two modes.

 

Since you can buy the PSE with or without the controls, I imagine it's available.
But in addition to the wiring and switch (if you don't have the Sport Chrono)
you will also need vacuum piping and the solenoid valve .
Check with Sunset Imports (800) 346-0182 or your local dealer for availability and cost.