Around town driving the 4.3 is fine, will happily cruise at 60kph in 5th. Highway is a little annoying if exhaust is loud. I have a varex muffler on mine, i just shut the valve and its nice and quiet cruising at 100kph. I have 4.36 im my 33gtst, have hit 243kph at around 6000rpm in 5th on the racetrack, i estimate top speed would be around 260 so still plenty of top end speed.