FI with continous high speed driving 130MPH+

Kamus

I've hit the speed limiter twice here in Mexico. There's only one road that I've dared do this though (it's a concrete road, most of it very straight)
The car has plenty of cabin noise at low speeds as it is. This is augmented exponentially once you hit the limiter. It sounds kind of scary actually.

I found that the trick to hitting 160 Mph on that road is not to shift to sixth too early (i found myself running out of road too early if i did this)
I could only hold the top speed for about 10-12 seconds before i have to slow down.

Now, with that said... the roads here are TERRIBLE for the Z. That is one of the very few bump-free roads here. When i'm on other roads even doing 75 MPH seems like life or death because of how bumpy the roads are. I don't like how easily the car gets unsettled by those bumpy roads at all.
I feel much safer going fast on those roads on pretty much any other car with a softer suspension.
Now, when i'm in the U.S. the car feels completely different. The road from El Paso to Dallas is completely flat and straight. I'm pretty sure i would have no problem at all hitting the speed limiter there and probably holding it for quite a bit too. But of course this is something i'm never even going to attempt and risk getting a ticket or worse.

But back to the bumpy roads of Mexico for a bit... do you guys think that some quality coilovers would help the car feel more settled on bumpy roads? Because like i said, even at low speeds (70-80mph) the car can feel unsafe at those speeds, I pretty much feel safer on my GF's Juke or my mom's A4 at even higher speeds than that because of how much better they deal with the bumps on those roads.

On another note. It always surprises me how people in the US complain that their roads suck (compared to Europe's), the ones in Texas are pretty damn good. Maybe they do suck in other states?