With the windows up, the Wind Blockers reduced wind speed at the passenger headrest by an average of 45%, which is significant. At 85mph, the reduction was a huge 84%. At 40mph, though, the Wind Blockers increased wind speed slightly.

With the windows down, the Wind Blockers generally raised wind speed levels somewhat. Best guess: windows down, the vacuum behind the car normally pulls wind over the doors and through the headrests. Windows up, there is more swirling behind the headrests, which the Wind Blockers effectively stops from coming back into the cockpit through the headrests.

Assuming an ambient temperature of 50°F, rolling up the windows reduces wind chill by 3.5°F.

With the windows rolled up, the Wind Blockers further reduce wind chill by 1.8°F.

With the windows down, the Wind Blockers increase wind chill very slightly (.2°F).

Compared to the windows down and no Wind Blockers, rolling up the windows and installing them reduces wind chill by 4.5°F.

If you prefer to drive top down, windows down the blockers are actually slightly counterproductive.

Being low cost and quick to install and remove, the Wind Blockers can be an effective part of your S2000's cool-weather "windows up" configuration.

Any additional quietness due to the Wind Blockers was not readily noticeable. But ambient noise is hugely and rapidly variable. The dB meter doesn't lie, but ears are apparently more easily fooled.

Given the effect of cold drafts on the back of the neck and ears, the percieved "warmness" effect of the Wind Blockers probably increases as the ambient temperature gets colder.

My usual passenger likes knowing her driver has taken all reasonable steps to ensure her comfort during cool weather drives at unreasonable speeds.

A passing luxury car increases cockpit noise by 3-4 dB, the same as a Harley at 100 yards.

A passing SUV with street tires increases noise by 4-6dB.

Full throttle acceleration at any speed registers 87dB, the same as steady-state driving at 85mph with the windows down.

At all speeds (including 85mph), running with the top and windows closed (up) increases cockpit noise by 3-4 dB. Wind and external noise is apparently more than replaced by trapped mechanical and road noise.

Cruising at 55mph in the slow lane on a mostly empty, new freeway, cars will line up behind you nose to tail, contentedly chewing their cud and following along.

As indications that Honda really did put a lot of work into the aerodynamics around the headrests and roll bars:
- During two runs when strong wind gusts were present (the 25mph and 55mph runs), having the windows up provided excellent protection from noise and wind increases in the cockpit.
- The Wind Blockers generally produce adverse results when the windows were down.

As long as he gets paid, the toll booth attendant appears to not notice that the same guy in a black roadster with wacky cockpit gear has passed through 12 times in the span of 2.5 hours... or maybe it happens all the time.

Didn't cars and trucks pass you during the test runs?
- Yes, extraneous winds and noises frequently intruded, but we made efforts to "delete" them from our readings.

Is this a scientifically valid teast?
- No, due to the above, the use of "hobby" meters, and the amateur statistical analysis. Unfortunately I lent my wind tunnel and anechoic chamber to Nasa last year and never got them back.

Do you have any background or training that would qualify you to perform this test?
- None whatsoever.

So these results are invalid, scientifically and statistically speaking?
- Completely.

So then, you won't be buying the Wind Blockers?
- Wrong, SUV-breath! They work well when I want them most- on long drives through the cool fall and spring air with my honey beside me...

For a PowerPoint presentation of this review (much nicer!) please click here.