ECU ?

I dont know what kind of ecu i should put in my st185 gt4 jdm .... ?

im stock at 200 km/h in 4 gear !!!! I want to go faster !!!!

use 5th gear

How have you managed to hit 200km/h....eliminated speed cut somehow? I took mine out saturday and my AVC-R hit 182km/h in 31 degree celsius sun at around 3pm when I hit speed cut!

Anyway, what year engine do you have? Get water injection, raise fuel cut and a boost controller and raise boost to 14 psi. If its top end you're after, get a rom tune for 550's, upgrade fuel and get a bigger turbo. (Let the bashing begin!)

Peace!