This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WDK-ATH-11 which was used for this installation.
IB-MB1-NC Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH4-C Speaker Kit

Voltage Regulator

Click here for more information on the WDK-ATH-11 and the rest of the WOWDiesel Kits line.