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I am gonna have to play devils advocate here and say GFX rear and side. The front sway bar only accounts for 6% stiffness, while the rear is already giving you the most change you will feel.
You also said you don't like the GFX front and I agree. If you plan on getting any lip it WILL look funny if you have a front lip and a rear but no sides. I was in that predicament once. The GFX sides can be appreciated in person.
GL
EDIT: saw your reference to the price of the sides, too much.. Get something else.
He already has the rear sway. IMO the front sway bar is a waste of money.
Well .... at least on the 250 - the front does make a big difference. Even if you have a 350, why not? Lexus designed the sways to be used as a pair...
I have a 350 and the 250/350 shared the same suspensions. The 6% information you guys got was a typo I think. Last time I checked lexus updated the front to 66% or 44% stiffer than oem front sway.