I should have said probably your woofer connection. But if your stereo doesnt have a decent lump of a speaker in the fish tank then the conector wouldn't be needed, so could be tucked away. But to be sure take a photo and someone smarter than me...
It was the inside edges of the fronts that have been wearing faster on mine. I had the tracking done everytime I got new tyres, so this higher pressure is my bit of tweaking.
Had a couple of new tyres put on and was informed by the helpful tyre guys that I had been underinflating. 30psi for the last five years or so, now I'm trying 34psi. Time will tell.