What car?

At least on my 2.5G Innova, I switched 4 out of the 6 turn signal light bulbs to yellow LEDs. That's all four corners except the peanut bulbs inside boith side mirrors.

Instead of using load resistors so that the LEDs can simulate the power draw of an incandescent bulb (and hence not flash too fast), I replaced the factory flasher relay with an electronic one that is adjustable.