inputs.text: easy install great hardware beautiful sound - searching product like quite time 2001 new passat wagon glx w monsoon stereo using stereo removal tools also purchased amazon easy access back radio model year cd player separate addon radio tell head unit basically 2 single din units rather one large double din unit slight difference install unit instead unplugging blue connector back radio head unit remove blue harness back cd addon ensure maintain cd player capabilitiesinstall went follows1 find larger brown wire main black wiring harness connected head unit either strip small portion wire clean splice use form easy clamp tool expose wires make possible connect ground ground wire came unit small ring adapter end cut expose wires secure however wish factory ground wire brown wire black harness2 find blue harness attached cd player addon case blue harness top head unit true double din units top right harnesses order small yellow green blue top large brown large black beneath remove harness depressing release side replace harness pies harness3 attach provided plug back unit end rca whitered female connector attach provided free rca 35mm jack cable red white ends female connectoryoure done install shove body unit stereo run wire many sites researched showed done removing climate control preferred method front dash right stereo seat heater open option slot solid black plastic spacer removed drilled hole large enough fit 35mm 35mm female coupler rubber grommet plugged provided 35mm cord back coupler glued secured dash piece replaced spacer dash viola looks factory made use normal 35mm cord plug directly dash without wires ran dashoperation goes well able select cdchanger cd player headunit register \\cd 01 tr 01\\ something similar able hear audio speakers attached mp3 player ipod iphone android etc