hey guys.....
thanks for ALL who comments on my thread,
today i went to my dealer to install the BMW performance exhaust.. and i've mentioned the situation regarding to my engine stalled.
they checked everythin and they found out that the "INTAKE VANOS" and "SOLENOID VALVE" had problems... i dunno what the hack was that.
... anyway they replaced a new 1 for me (warranty covered) ^^~
so in this case, there is nth wrong w/ the intake or the MAF sensor.... but it just happened right after i installed the intake, so i mis lead u guys , i apologize about it
once again, thanks everyone and enjoy ur ride~