The VPC is sorta out dated and hard to fine.
Another option is to look into the MAFT Pro which is a speed density setup using a GM 3 to 5 bar MAP sensor and IAT sensor. You can find more into at www.maftpro.com
I personally run the MAFT Pro with the GM MAP and IAT sensor combo using a Innovate LC-1/XD-1 wideband O2 setup for WOT AFR tracking. So far I like it.
Or... You can wait for DSMLink to fully support MAP/GM MAF in there next reversion.
That or drop $1200 to $1500 on an AEM EMS