[konafocuswrc]

what fm modulator does is, when you filip the switch for modulator, it cuts out all fm station..so there won't be any problem within city..
88.1 or 88.3 you can choose any of signal that is strong enough..

i live in toronto downtown, i drive there lots..i didn't have any problem with scosche kit..but i could be wrong..because i haven't tried 88.1 or 88.3..but others..

you might have confused btw fm transmitter and modulator..

anyway, for the best sound quality, using aux in will be the best option but obviously 07 focus doesn't have aux input..

go with aftermarket and it will give you full control over your ipod..