Insulation Golf 3 Already in?+ Which power cables?

Hello, so, I’m trying again with my sound…have ordered me now ne dragster da 704, the carpower may come out completely… So now I’ve also thought about damming the doors, today at noon I cut off the disguise and staun, in my golf 3 build year end 1995 is already such a kind of insulation inside, can it… the whole sheet is lined with black bitumen-like material, what is it? Now wants to expand everything and reinstall from the front… the following should now again: -pioneer 3600 mp -helix blue 62 mkII system -dragster da 704 (- possibly 2 Ls stay in storage back) Now I also want to get new power cable, have currently 20s in it, but is from the previous owner, therefore I do not know because of quality….was today at ACR, the seller said 25s from rockford fosgate is good, wanted 39€ (is not that a little much?) Then I asked at ACR immediately for insulation for doors, which meant that completely both doors cost 50€ the material, a In other words, for 9,90€ you also get a small set, which comes then only behind the Ls, which means that on the audio course it is conveyed that behind the Ls is enough, but themselves they would completely dam at ACR, because with installations for hundreds/thousands of euros, should not arrive at the few euros, which meant that I would have to know it myself. At an auction house I sent a salesman a mail, who meant it enough 0.5 to 0.75 m2 bitumen mats per door, has ten se t there with 40 pcs. in 25x10cm and 2,6mm thick, then he recommended to me still insulation fleeces, everything together would cost 40€ + shipping. What should I do? KAYDON