I have a 2008 x mr and wen I yes launch control I get a slow down light every time or when I accelerat hard it will hit neutral then start shifting hard but my every time I'm resivors are all full it has 50k on it and only mods a cone filter gutted cat and muffler delete no tune

 

First learn some grammar, or at least use some periods and commas.

Second. Maybe your not launching it properly? Also for those mods I think you would need a tune.

 

When was the last time you changed your SST fluid.

 

sounds like you are not launching correctly?
Is the engine freely revving to 5000rpm when you launch? Or is the car attempting to move, and you are only hitting 3-4000rpm?

 

I bought the car used 43k on it I correctly use the launch control if freely holds 5k I let off the brake it takes off the hits neutral I have serviced the transmission since I purchesed the car

 

sounds like you need a tune. get in touch with a tuner that has access to the sst tables. Kozmic27, Razorlab and some of the others can help you out.

 

Since you bought it used, the previous owner could have worn out the clutch discs.

Like stated before, get a tune.