Check the seal around the trunk lip.

 

Also, its unlikely to be an issue but it was for me, make sure the trunk is aligned correctly.

 

i have the same car with the same problem, but it only statered after being rear ended by a truck, i got a new bumper but it still leaks D:

 

zapps as well, definitely check the aignment of all the panels and trunk lid back there. you could have a perfectly good seal but if the trunk doesn't sit correctly water could pour in.

 

A lot of cars have this issue after being in a wreck. It's sad, but it happens.

 

alright, i just re-aligned them so next time it rains i'll let you all know what happens, thanks

 

sunroof drain tube out of place?

 

also check the seals around the tail lights