here's the situation, i have the boost set @ 1.2 bar for street and i've noticed when i installed my 3" exhaust and straight pipe, on 3rd gear, boost tend to dissapear fast when i'm driving normally.

for example, i rev up to 4,000+rpm and boost is at .4 bar, once i let off the gas, shift, i noticed the boost is gone and a loud "poof" but it doesn't happen to 1st or 2nd gear...weird...

normal?