Aftermarket vendors already have turbo upgrade kits for the PT.
http://www.psifimotorsports.com/turbokit.htm
I want to get it but I lack funds
I just met with them last night at the track. They were testing a Mini S. It is a twin charged car. It has a turbo on top of the super charger. They have to do some more tweaking but I saw it run 13.7 @ 106 with street tires.