That works too.
I ALWAYS run new wire and leave the factory wire and connectors intact, which makes it easy to put the OEM stuff back in should you sell the car.
This is the OFC copper wire I run to components and coaxial speakers.
This is a good buy on OFC copper wire for the subs.
If you want to keep all the infotainment and steering wheel functions with the new head unit, you'll need some specialized harnesses from Meastro and iDatalink. Check with
Crutchfield as to what you'll need, then check with me if you decide to go this route. I have a couple of items like the Meastro RR left over from my daughter's build, and could save you a good amount of money since they are vehicle-specific.
As for speakers, also have a pair of the Mobile ES 6x9 coaxials from that build (normally $275 to $350 a pair) that I'd drop for $200.00.
The front components would be the Sony Mobile ES-162ES - they'll set you back around $350- $400 a pair, but this particular Sony lineup is superb-sounding gear.
Sony Mobile ES XS-162ES
https://www.ebay.com/itm/306890820772?_skw=sony+xs-162es&epid=13047066760&itmmeta=01KR930Y9HBYMX1JGYQ65P355Q&hash=item47741e4ca4:g:ktEAAeSwA7pp5S89&itmprp=enc:AQALAAAA0GfYFPkwiKCW4ZNSs2u11xDX3zUUqw7Um/SsEmgVJhaHsqAwOv9ExACS4NZjA9ZJ5k3twxmhgaGoVDFoxxnui9M8by5RWBZAHOvnFL1Hb7kpDUa9BpbcYRqjOtUqiC6qn8QszX5aQLaHNxvrRzQNkDSZMy5ZhKcK3pxxjbqVUQSqNxeCrWpFpnngL5g5kQyeofpZ7X1QpW0hy8SfiKpWY+t4rlGBDKRZDFGMy9bNMN+Fs+gsUMcPNr7U7h3eTsEATj9PNe1LbQwkKEV5sgj0kZA=|tkp:Bk9SR5Dlg6PCZw
Check with
@Sakekura for reference, he purchased the 6.5" coaxials we didn't use as we went with the components up front instead.
As for an amplifier, a couple of options.
The Recoil RED1800.5 is the budget king in 5-channel amps, and it's a decent amplifier. 140 x 4 and 1280 watts x 1 at 1 ohm, hard to beat for the money.
https://www.amazon.com/dp/B0BZ8882ZD/?tag=caraudiocom-20
A step up (and worth the extra) would be the CT Sounds CT-1500.5 D, with a first-time or email sign-up, 11% off, and since I was going there for a pair of loaded 12's, a contender for sure. $239.00
The CT Sounds CT-1500.5D is a compact full-range class d 5-channel car amplifier. The 5-ch car audio amplifier features a Low Pass Filter (LPF), High Pass Filter (HPF), and Bass Boost so you can get the exact sound you want out of your amplifier.
www.ctsounds.com
And this to complement, same 11% discount, $339.00:
The CT Sounds TROPO-2X12D4 is a loaded dual 12” ported car subwoofer box that comes with two of our TROPO-12-D4 1300-watt max power 12-inch car subwoofers pre-installed and pre-wired internally to a 1-ohm final impedance.
www.ctsounds.com
At $1180.00 so far, that leaves $1320.00 left for the head unit, adapters and wiring, sound deadening, and other installation items needed.
This would be a pretty significant system and still fits both the budget and the stock electrical system.
Crutchfield has some good deals on Kenwood digital multimedia and CD/DVD head units, and so does
eBay. Just depends on whether or not you play CDs/DVDs or not.