Thanks fmugur! I appreciate your quick and helpful tips!!

Blkxer, that got to be one of the best responses to a thread I've ever read!!
My hat to you my friend Very thorough and answered all my questions.

One last Q, I like your list of options and materials, what is the total cost you estimate if you don't mind me asking?

I'm mechanically inclined but not electronically especially when it comes to amps! Are you planing a DIY? That would be the first for X5 with nav and DSP write up? If you do , I might opt to wait

Thanks again for your very thorough response!

__________________
Current:
2017 640Xi Convertible
2011 Acura MDX
2018 Santa Fe

Past:
2013 Honda Accord
2008 Acura TL Tech.------2004 BMW X5 4.8is----2004 Acura MDX Tech
1994 BMW 525i.----------1994 Lexus 300 GS.----1994 Acura Legend GS
1991 Acura Legend LS.----1991 Honda Accord.----1991 300ZX twin turbo
1996 Buick Regal GS.-----1984 300Z 50th anniv.--2002 BMW X5
1982 280Z