dmpus

145m/h and it kicks the limiter. It's ok to drive with that speed on a good straight and empty road. It's not that fast..
The is350 with good balanced tires feels very comfy at that speed, however the brakes are not designed to handle a hard braking from 145 down to 50ish and the car starts shaking.

See5

how to unlock the speed limiter ?

Toxicxk23

Took it to 142mph once. Never did it again. However on Highway 64 in Arizona and I hit about 125mph and slowed down. I only went that fast on that road because anyone who has been on that highway knows that it's basically deserted.

Individual

iTrader: (7)

I went 120 on my IS250 and so far 100 on my IS350, sad I know.

BALewis1

I have only been up to 120MPH in mine... I use my 08 GSXR1000 for speeding... speedo said 189MPH

RastaRacer

iTrader: (5)

Ive got mine up to about 120-125.

Toxicxk23

Ain't nothing more sad than going that fast and crashing! Be safe!

ms2619

iTrader: (5)

135 mph i wanted to push it to the max thou :/

reyoasian

iTrader: (2)

160........................km/h :P

Tapangb

I've gone up to 120 but even that was scary. I don't know if I'll ever take it up that high again. It was on a mile long straight away in the middle of nowhere. As soon as I hit 120, I immediately had to start braking. Not a car in sight. Just me and the wife. She looked more excited about it than I was.

NickawdIs

iTrader: (1)

115mph in my is250 racing my boy is300 i let off , radar was going crazy , later to no the cop was in the bush wat a nite !

NorCalIS

iTrader: (5)

Taken it up to 120mph a number of times, couple been at the track (kept the foot down past 1/4 mile). But the fastest I've taken it has been 135ish... Have to be careful when doing that though!

gompka

iTrader: (6)

I have done close to 120 or so just to see what its like, on a side note I always wonder why they allow cars to go up so high if the limits are not over 80mph lol, sure people would hack the system but 98% would not. I barely get out of the city though so acceleration is much more important than top speed.

blackgpgt

iTrader: (4)

Right around 125.. Have an awesome strech of highway right by my house and once in a while there is no traffic whatsoever..Like many have mentioned in previous posts, I am too scared to get another ticket so my eyes are on the rear view most of the time

Individual

iTrader: (7)

True that! Thanks! Yeah, once I see the red ring of death, I immediately let off and slow down.