Hey. My 2004 WRX went to safe mode, check engine on. Showed that its MAF sensor. Exchanged myself. Now its running over 4000 rpm's but still has no kick as it used to have. Is my turbo down? Not showing any codes now. Purchased ScanGaugeII and here are some readings on neutral, stopped, engine running:
IGN: 9 to 12
MAP: 5,7 to 6,3
Anyone got an idea what the numbers should look like?
Car has got 5MT, K&N Cold Air Intake (in the fender) HKS Air Power Muffler, apart from that it seems stock.