Hello. I would like to use my stock HU which does not have RCA jacks.. I have been reading about a little device called a PAC trunk LOC... Has anybody on this forum ever used one? Does anybody know how to wire one up in a 2001 wolfsburg Jetta? Where should i even start? People said i need to hook to the rear speakers but where is that harness or wires located even.. Some help on this situation would be helpful Thanks