I have the 3157 LED bulb in my truck. You definitely need a resistor or turn signal will hyper flash as mine does now. I am hoping to find a stock resistor to plug in, thinking maybe Infinity might use same type.
Maybe also look for a hyperflash relay to replace the existing flasher relay ? Easier to use and safer than the resistors, I heard sometimes they could get quite hot
You just need to find out which model number the bulb is, and then do some web search for " XXXX Led equivalent"
It will eventually lead you to the right bulb, then search out the ones with built in fan.