I think the govt put an end to having the filler in the rear because it would piss gas if you got rear-ended. Not a good thing to have squirting out of the rear during a collision.
Sounds gay to me... 
BAN THE RAINBOW FLAG!
PERVERTS OFFEND ME!
"When is penguin season, daddy? I wanna go kill a penguin!"
---- 4 yr old Archerhuntress
| 
