Hi,

recently my evo 5 has been doing so well... then all of a sudden performance dropped. I knew it wasn't anything that's going wrong with pipes, etc... since when it happens (and it's happened a lot of times before), I just simply reset the ECU and turn it on again, then power comes right back...

then tonight, after going through all that, I found that the car was doing quite well again, after a good run. But I saw that my boost was dropping significantly. I set the boost via the EVC to 18 psi and it's been holding for the past few months. Then tonight it would peak at 18 psi, and drop to 15...

Anyone has an idea what's going on or maybe someone else had this problem already? Need your help guys, thanks!!!