I think 6" fit but the stock speakers are screwed through the steel, (ie: no plastic to mount new ones to), I drilled holes in the steel to mount mine, seemed to work alright.
the light just tells you when you're driving economically, the mode is still active. I had it in a GH8 impreza S/GT and if you're under boost (ie: going up a hill with rpm about 3500) and take it off it feels like a kick in the pants.
I had it happen in a bh legacy. I worked out there was 20mm difference in circumference front to rear, was enough to lock the diff on even short drives.
My heater fan seems to have jumped a speed setting, when its on pos 1 it seems to be on 2 and so on, on pos 4 it doesn't go at all.
I have done research but can't find anything like this.
Can someone please help?