JVC HU & Speakers

HiRez

Hello,

I am new to this audio upgrade area and have some basic questions:
1. Would replacing the HU & Speakers void any warranties on the car?
2. Interested in a simple unit with clean sound and HD-Radio capability (not bone shaking bass). Found JVC KW-HDR720 with built-in HD-Radio tuner and JVC CS-V607 component speakers.
(i) Will the HU function with steering wheel controls ?
(ii) Is the stock antenna good for HD-Radio reception as well ?
(iii) JVC lists the CS-V607 as 6-1/2" with a mounting depth of 2-1/4"; can these be installed without cutting anything ?
(iv) Any ideas about the installation cost for a simple setup in the Bay Area ?

Thanks in advance