My brother had these on his car and i really liked them. the only problem is is i cant find any for a 2011 Scion tC or a tC in general. If anyone knows a good reliable site that has these please post it below!!!

 

You do realize that when you turn on the parking lights on, on a TC there is a bulb for that. The turn signals don't work as duals on this platform

 

Correct. TC2 Uses 7440 bulbs which are SINGLE filament.
The only way this would work is to use a 7443 switchback LED bulb, change the socket and grab power from the parking lights.
It's not very difficult to accomplish if you are good with wires.
Only thing in not sure of is if a 7443 SOCKET will fit the headlight.

 

yeah switchbacks are mainly for vehicles that use a parkinglight circuit along with the turn signals with a dual filament bulb

 

it is possible , and as far as i know , im the only one who has done them to a tc2 , I used VLED.com V3 Triton switchbacks which are very high quality very bright , and of course pricey. I had to do a custom relay harness. With no real diagrams I had to do myself. with that said, I do have background working with electronics. I love mine, tho.