any place there is a light bulb originally...you will need a resistor. There are also some LED's that when you replace them you will need a resistor case they are 12v. Only things you cna change without adding a resistor are the switch lights.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.