I'll differ on the order of modification.
I change speaker drivers first. OEM drivers are notoriously the cheapest - shall we agree on 'crap'? You can often effect a noticeable improvement by simply fitting better more expensive drivers - in the Kappas I suggest the door speakers and the tweeters (the rears have less effect on the musical experience, and the subs are hard to find an improvement for using anything like the stock enclosure).
Beyond that the head unit will certainly have limitations, but the advantage of it is that it is an anti-theft device all on its' own - no one will want to steal a factory stereo while they will usually jump at a marketable after market unit.
Frankly, unless you already have a good home stereo, I'd say to put that head unit upgrade money into the home system where you can really enjoy it.
1957 Jamaican MGA
1958 MGA Twincam
1962 MGA Coupe
1971 Jensen Interceptor
2007 BMW Z4M coupe
2009 Pontiac Solstice GXP Coupe
1965 Jensen CV8
1969 MGC roadster,
1969 Lamborghini Islero S
1988 Pontiac Fiero GT
Bill in BC
Last edited by wspohn; 07-26-2018 at 03:18 PM.