i've been thinking about it. they're a bitch to make, the voltage comparator is so impossible to solder anything to. i'd have to find one that's more along the lines of a 555 dip timer (with the 8 big pins sticking out instead of the surface mount machine flow soldered chip that i'm currently using) in the lab, it works perfectly and one is able to adjust the "force open loop" point to any boost (or vacuum level) that one desires by use of the 50k ohm variable resistor. however, i still need to box it up and put it in the old 2gnt and see what happens.

if everything goes as planned (i.e., it works) i guess i could be able to make them in my spare time... based on the cost of parts and the PITA of labor, i'd probably sell them for maybe $40 shipped? just a ballpark figures right now.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)