if you're looking to save money, but still want to see a difference, don't bother swapping out the front and get the rear USDM ITR swaybar.

you'll need a mounting/reinforcement kit such as beaks or BSQ. i personally have the BSQ kit (for about 3+ years now). i've had no problems aside from one of the spacers corroding for some odd reason and that got replaced for free.

and yes, you will notice a significant improvement with this alone. understeer will be notably reduced.