Hey , I have just purchased an 08 WRX and i have noticed a few changes with the car since i bought it. Sometimes the car will have great "pep" or power and the boost is very smooth, and other times the boost will hessitate and there isnt as much pep. Could it be the different brands of gas. I always put min 91 octane.
I have also noticed that i now hear a pfffffffff ing sound when i get on it, under the hood ( not the BOV). Its almost as if there is strong wind hitting under the hood, like the turbo was just blowing air on the hood of the car. Weird, any suggestions. Thanks.