walbor

Just bought a 2011 Vellfire, it originally had an Alpine x08s system which, unfortunately, the dealer replaced with a crappy double din no-name unit. Looking to upgrade speakers as well, does anyone have a wiring diagram and details of speaker sizes that may help? There's also an Alpine screen in the rear although I don't think I'll bother trying to get that working. 2011 3.5 Gold model - GGH20 Thanks in advance.