i've seen 1 thread about this problem and i haven;t seen a clear answer on why the evo would shake when it hits the high rpm.

i hope that it won't happen to me, but i am just curious of what could cause this problem

what do you guys think?

 

Dude, who told you this? I feel no "shake" when it hits "high rpm" (what's your def of high rpm?). This sounds like a henny penny type of observation.