This advice comes from experience. I fooled around with trying to make my tail lights brighter for a year or more. Will not even list the "ideas" used - (none worked with a Sh**). I did, however manage to fry an expensive turn signal switch for a swing away wheel! Finally purchased a Mustang Project Ultra Bright sequential turn signal kit after seeing one in operation at a display at SEMA and man oh man, what a nice setup it is. And yes, you have to do some things to the front turn signals and change the flasher but you will not regret the display of lights. My headlights no longer dim at idle when the turn signals and brakes lights are actuated, no burned up brake light switches or melted contacts in the turn signal switch - just lights that ANYONE can see. Many other drivers who have followed us on cruises or club outings have commented on how visible the tail lights on our Cs are now. They are bright even when the evening sun in shining on them. Expensive? Yes, but because of my continuous searching for brighter lights with regular bulbs and "parlor tricks" I spent far more than needed going in the wrong direction before purchasing the LED boards. I think there are 108 LEDs in the CS kit, not certain but over 100 for sure. One light did not work correctly and they sent me another instantly with no questions. Just a good company to work with and good service and advice. Fool around all you want - burn up switches, melt lenses and aggravate yourself Just as I did, but the answer for me was the LED boards from Mustang Project. Some of the best money I ever put in that car from a safety and functionality point of view. Just one guys experience. In case you are curious, I have absolutely in involvement with the Mustang Project Company - just giving you the benefit of my search for brighter rear lighting and safer driving.