Thanks for your reply =)
I have also considered other Big Brake Kits such as Endless, Project Mu, AP, Brembo but they are all way too much expensive than the IS-F kits I found in Hong Kong.
And I like the IF-F kits very much because it says Lexus on it :-P
Do you know if GS430 can install IS350 brake kits?
Thanks again!