Our Project Lexus IS-F has never gotten a performance front swaybar even though it has a larger adjustable Sikky Manufacturing rear anti swaybar. The main reason is no one makes a front bar for it! The other day when changing the oil we noticed that the front bar could easily be modified to make it two way adjustable and stiffer!
Step one was to remove the stock sway bar. On a lot of newer cars this can be a bitch requiring dropping the cross member. Fortunately on an IS-F this isnt too hard. You simply remove the under tray and unbolt the end links, ride height sensor arm bracket and main bushing supports.
Next we drilled a new hole for the end links. We could move the mounting hole forward a little more than an inch, this makes the bar about 12-18% stiffer, definitely enough to feel while driving. Since the bar s irregularly shaped, it is hard to figure the increase in stiffness exactly.
For the endlink nut to sit perfectly flat, we had to grind down the weld for the front ride height sensor arm bracket.