hight boost the car and steering shakes , boost leak

[shuiyuan]

i really need help now! when i push hard boost in high rpm around 3.5k my car will shake(seems cut gas or air)
the dealer said i have boost leak problem by BOV( apexi twin chamber BOV) then said they fixed. but after 2 days the problem came back.
is there any DSM speciallist shop Around LA, man, i paid $300 in a small shop in Industry.
paid $100 in other shop for find the problem
Paid $1200 for only reset the timing in mishibishi Dealer!!
now, the problems still in my car.
DSM really has a lot problems??

 

[Trainer7904]

how much boost are you running? what kind of turbo? any other mods i.e. fuel system would be helpful to answer this.

 

[KuZo]

what kind of shake are you talking about.... like a spit and sputter shake or a shake like your wheels are out of balance?