[CSIPSD]

Boost regulator from ITP is about $70 Last I checked.

 

[CSIPSD]

dieselsite has a good version that works perfect too..

if you get the itp version don't play with it.
put it in, and know exactly what you do to it as far as changing settings.
it can get out of sync and require resetting....ie read the directions first.
other then that it should be easy.

I had the dieselsite version. I would still set an overboost every now and again.