Boost drop / Advice

[Shainal1]

I have a 2006 Subaru Legacy GT. When I first purchased the car last year it was running 15psi boost and then after a few days it went down to 9-10. After resetting the ECU it was running 15psi again however after a day it went back down to 9-10psi again. For a few months boost always changed where some days it would go back up to 15psi but majority of the time it would just run 9-10psi.*

 

I had my car remapped this week and for 2 days it was boosting at 15psi again however today the same issue happened where the boost dropped back down to 9-10 even after the remap. There are no check engine lights.

 

Everything is factory apart from a catback exhaust however the issue was there before I purchased the exhaust. Always runs on 98 octane. There are no signs of any cracks in the lines. I have also cleaned out the MAF sensor however issue still persists.

 

Has anyone else had this issue and how did you resolve it?

 

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