1157 is a Dual Function Light, 2 LED Lights with Wide Pattern Technology. High brightness and super long life. Do not install behind red or amber lenses. They will not work well. For Clear lenses only! Some cars do not work well with LED bulbs, and honestly there is no way to tell until you try.
If your car has issues such as blinking too fast, or not turning there is a resistor solution.
Simply connect a high wattage (20-50watt) 3 ohm or 6 ohm RESISTORS Parallel to your bulbs. Click on the picture above to see the solution with 6-8 ohm resistors. These must be at least 20 watt resistors. Radio shack does have it. We also sell them here