Ok here is my situation. My rear subframe is out of alignment. I had it replaced and the shop didn't do a good job aligning it and my toe is off in the rear. Let's say I go with the SPC Control Arms /w Toe Bolt and I am able to get my alignment perfectly, what kind of disadvantages do I have leaving the rear subframe out of alignment?

 

The car could "dogtrack" down the road. The tires may go down the road straight but the rear of the car could be out to one side or the other.

 

Hrm... gotcha. How detrimental could it be to my handling over stock?

 

itll severely mess your handling up and wear tires very fast, go back and tell them to do it right.