does the aftermarket kit light them up sequentially when you hit the brake too?

I sat behind an 05-09 mustang with a/m sequentials that lit up when he hit the brake. I was really, really, really tempted to just rear end him to make it stop. Fortunately for me I was in a company car.

As turn signals, it looks cool. As a brake light, it's painful.

 

Mine don't sequence when i hit the brake. It just does one chase, then they hold steady.

 

Yep, mine sequence out then all stay lit after the first cycle.