I was only 14 MPH off, and I've seen crappy drivers trapping that speed on a mile in a stock Z. I've been over 170 in my car plenty of times and as you know you're running through alot of real estate real fast at those speeds
Keep us posted on what you do.
It makes night driving better IMO, less glare from oncoming traffic, plus I've got HID's so I can see fine . I wanted to go darker, but decided 35% is a good middle ground.