That looks pretty much identacle to the PWR kit. It's an Eaton M112 twisted roots blower. I think you'll find the Harrop kit which is similar in execution is much cheaper than US$6K. The non intercooled kit is AU$5720 including GST
Here's tha harrop kit
Here's a link to the PWR setup:
PWR LS1 Super Charger
Sorry to Hi Jack this thread fellas.
Cheers