Just had coilovers put on my 09 STi. I'm wondering what your alignment specs are after lowering. I know in stock form our rear suspension doesn't have camber adjustment. Did you bother to get rear LCAs? How much camber are you running and how low is your car?

Trying to see if I need to go rear LCAs.

TIA

 

It's all going to come down to how much you lower the car, I would get the LCAs anyways to be able to fine tune your rear alignment and grab any other items to go along with it so your rear is set up and done.

 

Ok so looks like i've got my alignment squared away.

After installing the coilovers and lowering approximately 1.5". Sorry didn't take before measurements so don't have an exact number. Here is what I got.

After coilover install before alignment:
Camber
F -0.7 -1.2
R -2.2 -2.7
Toe
F -0.19 -0.11
R 0.07 0.07

After alignment with coilover: (no rear arms)
Camber
F -1.0 -1.1
R -2.2 -2.9
Toe
0.0 all around

Now after alignment with rear arms: (checked the drop on the rear and it was off from side to side hence the difference of rear camber from side to side seen above. i matched them before bringing the car in.)
Camber
F -1.8 -1.8
R -1.3 -1.3
Toe
0.0 all around

Stock range for an 08-10 STi: (you can see that a lot of rear camber is allowed. seems to be the cause of our understeer)
Camber
F -1.4 0.1
R -2.3 -0.8
Toe -0.06 0.06

Before



After

 

Drastic difference with your pictures since you added rims!