hello i have a 04 sti and 2 days ago i started getting this screeching sound right after i installed my new tires. at first i tought it could be the tires but im not sure what it is because it seems to becoming out of the engine. seems like it starts at 4grpm all the way up when im in boost at lower rpms i cant really hear anything. i checked the lines for vacuum leaks and everything seems tight im stumped on this. I have 25k miles on it.