What is the best suspension for improve handling and lap times?

Originally Posted by Rusty

How much track time do you have and what mods have you done to the Z so far?

Originally Posted by OptionZero

sounds like you're new

get some better tires and the requisite safety equipment.
rack up some track time
see if this is something you wanna commit to

if you really wanna track your Z

powertrix, fortune Auto as entry level coilovers
SPL FUCA + rear arms and get an alignment. watch the for sale forum for deals
some 18x10.5 or 18x11 light wheels and sticky tires
pads
lines
fluid
oil cooler

the sport brakes will be fine until you are putting out much more increased power and have appropriate level of tire to require bigger rotors/calipers