I have the iPod Integration Kit on my 2008 STi. Worked great with my 3G and 4. Doesn't work with the iPhone 4S or the 5.
I've been doing some research on this and so far haven't found anyone with a solution. I've tried a couple different extension cables, a voltage converter, and even the new adapter from Apple. No luck.
Has anyone out there fixed this problem? My dealer said he's heard of the issue, but they aren't aware of any way to fix it.