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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
New speakers and some sound deadening isn't thar expensive or hard to fit.