Hi guys. Im soon going to lower my s3 on coilovers. Im hoping to lower the rear 20mm and the fron what ever i need to level the car out. Now afterwards i want to get the 4 wheel alignment done but my question is who decides on where the wheels need to go. Is it a factory figure or will the fitters know what is best. And how do i know if i need tie bars. I know there is some debate on wheter you need them at that level of lowering or not so how do you decide?im useless with understanding this stuff so any help would be great thanks. Daz