S3 8l Headunit

TurboLover

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Hello.
I have S3 8l 2001, double din with RNS-D, full bose. I want to use Alpine-IVE530BT or Kenwood-4028BT. My questions are:
1- Which adapter do i need to power the bose amp? RC9-409 or RC9-410?
2- Is it going to be better to remove stock bose amp and get a 5 channel aftermarket amp? Or 4 channel for the speakers and another one for the sub? And if i do, i will have to rewire the 4 speakers and the sub, right?
3- What impedance are the speakers and the sub?
4- Which of both HU is better?
5- I'm thinking of making custom stealth sub to replace the original plastic ****. Where can i get info about the optimal size of the box and the speaker?
Sorry for my bad english.