The box on the roof is for GSM, SOS, VW connect
Fm has a aerial in each mirror, dab is drivers side only
not many speaker options unlike the T6, the T6 can take up to 8” door speakers, T6.1 only can take a 6.5”
We are offering Audison AP6 kit with tweeters and a compact digital amp, which is all plug and play
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we been supplying twin seat enclosures since the early T5 days, passive so will need a external amp, they sound awesome, maybe consider our Signature package which includes this sub set up, hertz speakers, 3 channel JL Audio amp to drive the sub and hertz. JL Audio Bass control, etc