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I found a great link for those looking for the Bosch Bypass Valves.
Bosch Bypass Valves FAQ
It's actually a Supra Owners Group FAQ, but it has ALL of the information on the Bosch units. They even include the Porsche Bosch BV info and these supposedly can handle 16psi and above.
Great link!!
Keep in mind though that the following part numbers for the Bosch bypass valves are in order relative to their ability to manage boost pressure (from low to high)
Bosch: #0 280 142 103
Bosch: #0 280 142 108
Bosch: #0 280 142 110
The 103 valve runs about $20-25, and the 108 & 110 run around $40