So, today I bought my first WRX. It's 2005, 47k miles and it is completely stock. The problem is, when I accelerate as soon as it gets to 4000 rpm it stops accelerating. I can't get it past 5000 rpm. I can't really explain it, it's just like the car just stops pulling and literally wont go any faster past those rpm's. It sounds like the turbo is still spooling and I can hear the blow off valves when I shift. Also, the clutch is still really tight, no grinding or anything. Someone please help me I know nothing about these cars. A friend of mine said it might be because its not getting enough air? Please help.