Fitting UK headunit?

[A L 3 X]

My Glanza currently has a Pioneer Carozerria or something headunit which I prosume is externally amped as it has an amp under the passenger seat with the same brand, it seems a decent enough unit but a couple of things are making me wanna change to my sony single DIN unit with an amp built in, is it just a case of buying an ISO lead like this: http://www.ebay.co.uk/itm/PC2-17-4-Toyota-...=item2314c1208a

As the description says something about it only being for externally amped systems?

Or is it more difficult and i'll need to rewire everything?

[_shaun_]

yea mate should just be that lead u need nice simple swap

[A L 3 X]

Ah brill, i'll get one ordered then, thanks

[A L 3 X]

Ah brill, i'll get one ordered then, thanks