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@Fox Upgrading speakers is fairly easy. Best to upgrade to decent speaker wire as well
I would recommend Alpine stuff as really good.My stereo is only 50 watts per channel but the speakers can handle 200 watts plus a 300 watt amp running a 400watt Subwoofer in the boot, spare wheel turned upside down and fits in that space, the bumpers start rattling before the speakers do :)
Check car audio security, they sell dynamat sound deadening as well, check their vehicle specific list for direct replacements with no need for adjustments.http://caraudiosecurity.com/speakers-subs-1/manufacturer-alpine
Doesn't sound that different to my 14 year old Civic, but it has at least 6 airbags, 5* NCAP and no rattles/clunks :)
I just leave the VSA and auto lights and wipers on, and we have to be selective about what music we listen to on the motorway because you can't hear some (the speakers basically have zero bass and it's not terrible but the sound insulation is not great). Part of me would like adaptive cruise but I enjoy gamifying my driving by seeing how long I can keep the cruise control on at once (personal record down the A120 at night) and it would knock my mpg...