Hey, Im lookin to buy a Borla Cat-back Exhaust System, Injen RD Cold Air Intake System, Eibach Sportline Springs, and a Header but im not sure which company would be better...Im not sure about what all i'd need as far as lowering my car...i'd like to put new shocks, etc on my car....also, does anyone know if 19" rims will fit on a Mazda 3s HB....Any comments???