hi dreamZz..
Fyi, i have change my original brake to Toyota Aristo model..
For the performance, i dont think we need 4pot for standard perdana, even for perdana with evo engine, 2pot is already good for braking unless for heavy track use, u might consider to have 4/6pot..
there are 2 ways to install this thing into your perdana..
1st: modify Aristo disc to 4 hole
2nd: modify your original hub from 4lugs to 5lugs.. =) - must change new wheel set
both modification need new bracket for caliper..
You also need to have at least 17" wheel with proper offset at least 35..