The following is a DIY step-by-step on how to upgrade your OE rear sway bar as well as front and rear endlinks thus allowing for a more controlled ride and better handling.
At first, I replaced the rear sway bar only as the endlinks did not arrive on time and that already made a huge difference as the rear no longer swayed on turns. Once I added the upgraded endlinks, I feel the car is better poised and quite neutral versus displaying understeer as originally tuned from the factory.
I did not change the front swaybar given its already huge stock diameter. The objective of this modification was to balance out the rear handling characteristic of the vehicle by bringing it closer to that of the front and thus providing a more neutral feel.
I upgrded the rear stock swaybar to an Acura TL AWD rear swaybar and to accommodate the now thicker bar, I went with Subaru Tribeca front swaybar bushings. (pic 1 - 4)
stock endlinks have been replaced with KARTBOY 2008 Subaru WRX endlinks (pic 5)
stock endlinks have been replaced with RALLITEK front WRX endlinks (Pic 6)
Stock rear swaybar (14mm diameter)
Acura TL AWD rear sway bar (part #: 25300-TK5-A02
Tribeca bushings incl part #
KARTBOY rear endlinks 2008 WRX (purchased from www.fredbeansparts.com
part #: KB-017-08
KARTBOY supplied hardware but you will need 2 extra bolt just like this one, so take what KARTBOY supplied to your hardware store, and get 2 more along with 2 extra properly fitting nuts..spend the extra $$ and get stuff that is less prone to rust - I think they are 3/8 16 x 2.5 "
RALLITEK front endlinks (part #: RTK-HDELF
put car on ramp
Disconnect sway bar from endlink, and endlink from chassis using 9/16 wrench, use penetrating spray to loosen the rusty bolts.
: Replace OE rear swaybar with Acura TL AWD rear swaybar and new KARTBOY endlinks. You will have to wiggle that OE swaybar lots and it 's tricky but there should be no need to remove wheels or undo exhaust.
Be sure to put new grease on those Subaru Tribeca bushings (i used ball bearing grease)
Difference between OE and KARTBOY endlinks
: Repeat the same process on the opposite side. Once done it should look like this (caution: do not tighten/fasten anyone side fully, simply put all parts into place, put all washers & nuts on and loosely assemble as this will allow for an easier fit and adjustment)
: repeat same process but in the front using RALLITEK front endlink
Difference between OE front endlink and RALLITEK front endlink
TIP: most endlink will have a HEX key hole. This is so that you can insert the hex key into the hole and hold it steady while loosening or tightening with a wrench, as per pic. If you do not do this, the endlink bolts will simply turn on themselves.
Once done with the front endlink, it should look like this