Watch out Jack.
A 150hp kit on a 4 cylinder PT with powdered metal rods would only work once!
I've installed a lot of nitrous, and tuned a lot of PTs.
About 75hp is all the engine internals will handle.
I have photos of bent rods.
I own a performance shop and have a nitrous refilling station.
There's a lot more to it than just bolting on a kit and pushing the button.
There's a NitrousWorks installation guide here:
http://www.ptdoityourself.net/ptnitrousguide.html