Is MSD 6BTM needed on Charged car???

The 6BTM has an adjustable boost/timing retard function to allow you to adjust timing based on manifold pressure. This in turn will allow you get more aggressive with your timing yet prevent detonation under load. If its there, you'd be leaving a lot of power and safety on the table without running it.

That being said, if you still choose not to run it, there's no sense having it mounted there in the first place. You're shortening its life span with the bouncing around, heat/cooling cycles and unnecessarily exposing it to moisture. Its kind of one of those **** or get off the pot things.