my fit is an '09 base, i had a trd rear sway bar at my '08 yaris sedan before.
The rims i had before was 15x7, offset 41 - no issues at all, although the yaris was not lowered...
i really felt the improvement that sway bar brought, the handling of the car
improve a lot.
that's why i am going to get a rear sway bar for the fit too.
my work entails me to drive a lot...

 

agreed with this.. in addition of sway bar will be better..