Here's a few threads with related info.
Dinan/Vortech "S-Trim" and "Si-Trim" impeller blade upgrade information
Boost/Leak pressure test
Dinan S/C: vacuum hose routing block diagrams
If anyone ever needs the entire S/C install manual, I have it on .pdf and would be happy to e-mail it to you. The file is too large to attach here.
Attached is the DigiKey data sheet for YAGEO resistors. This is the 0.6mm leg, 1/4watt, 1% tolerance resistor that Dinan uses in the R4 position of their Turbonetics T9 box. After my Si-Trim impeller swap, I read 4.39v with the previously installed 221 ohm resistor in the R4 socket (Dinan install step 234). I changed to a 205 ohm resistor (next resistor size down in the Dinan D443-0932 resistor kit) and read 4.67v. I then reverted back to the 221ohm resistor. Math say that 213ohm resistor would get me really close to the Dinan recommended 4.50vdc-4.55vdc.
As you can see in the attached .pdf there isn't a 213 ohm resistor. I ordered five 210 ohm resistors (part: 210XBK-ND) and five 215 ohm resistors (part: 215XBK-ND) from
www.DigiKey.com (for $3.50 shipped) and that should get me close enough in the 4.50vdc-4.55vdc range.