Does anyone know where i can go to fix up my 1997 Infiniti J30? I recently purchased a set of 18' SSR Rims, and now, i want to upgrade my brake system, but it has really been pain in the ***.

I also want to lower my car too, so that the rims would looks little bit better, but i have gone to many many fixed up stores and they told me that they do not carry any parts for my car. All Infiniti J30 lovers out there, please help me out. I live in LA, so any recommendation of the shops around LA would be Best.
Thanks
:ylsuper