So do your signals flash at the correct rate or faster? The higher resistance/lower current flow of some LED's causes the flasher relay to "think" there is a burnt out bulb. Also do your lights look red? I've seen some that are so bright they make the tail lights look pink.
The flashing rate is the same as before. The red tail marker light and (brighter) red tail brake light look red to my eyes.
They are much brighter than stock and should increase visibility.
FYI, for those that have not changed these bulbs, there are no tools needed. Open the trunk and hand loosen the 4 protruding screws. The plastic lenses will come off the back end if gently tugged on.