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To improve the handling on an IS250 RWD, would I need to purchase a kit like Hotchki's that come with front and rear sway bars, or would just replacing the rear sway bar like the JUN-TW be enough?
Just replacing one is fine for daily spirited driving. But if you want a balanced suspension with max performance, replacing both with a matched pair is a must.
I also would say both. When I had my gen1 IS I installed my TRD yellows in the front and didn't have enough time to install the back. After a night out of driving and installing the rears the following day, I could definately feel the difference. GL
I'd recommend both, and I'd recommend the F-sport bars over the Hotckis ones too. (same rear bar, F-sport is smaller front bar though so less understeer)
I think when you purchase the kits, they only come in a set (Front and rear). But i just install my Hotchis sways and i know they're the best investment i have made. Love when the car does'nt lean and the handling made a big difference