I have a 2006 Infiniti and it makes about 400 whp. I want it up in high 600s. I want it for a nice fast car on the road. These are the things that are in it already. v3 sci vortech kit
600cc DW injectors
255 wahlbro fuel pump
1 step colder spark plugs
Uprev maf gt
aem gauges
pillar pod
z1 flywheel and clutch combo
bc racing coilvers
hks true dual exhaust
tbw undershield
(everything mentioned above has less than 1k miles)
lighweight aluminum drive shaft
mrev2 with 5/16 spacer
nwp throttle body

What else could I upgrade or install that can get me there?? Thank you.