hmmnn.. sure you want to do it.. unless your car has a lot of modifications.. then it's worth it..
first, you will need new valves - RM90.00x24=RM2164.00
then new valve seats - RM80.00 ? x 24=RM1920
labour to grind, machine, port = RM1200.00
total ? RM5284.00
it's like buying a half car..
my 2 cents.