Hello everyone! im new here. can't find my awnser im looking for so i made a post..
So here's the problem, i have a 2002 wrx and before i changed my up pipe i had problems with the boost. On my gauge it usaly (when i first got it) stayed between 0.5 and .-1 towards the middle. Now its at atleast close to 0.5. And when i accelerate i hear this annoying whistle noise ( not the turbo sound) but its in that area. I just changed my up pipe for a performance one and still that sound is there also the boost is not corrected to what it was before the problem. Also going into second gear i feel a loss of power.
What can be the problem?