I had to go into the office today, which meant longer on the motorway and a chance to drive some roads that I know are a bit rough in places. Think I can be a bit more conclusive and say that there is an improvement. The car is quieter on the motorway; there's less hum coming from the firewall. I think I must have not been tuned to it before, especially as I have an aftermarket exhaust - but when concentrating on the road noise, I could tell something had changed. I think for those of you who really have noticed the resonance, it would be a bigger improvement.
However for me, the most noticeable improvement is the way the car rides surface imperfections now. To my ear, it definitely sounds much less harsh whenever the wheels are hitting small potholes, manholes, tarmac repairs, things like that. Don't get me wrong, it's not like it's transformed the car into a luxury cruiser, you can still feel these things. But as the front wheels hit them, it just sounds more muted, as though less of the impact noise is being transmitted into the cabin. Not exactly Rolls Royce, but at least a little bit less cheap, rattly sports car.
I intentionally straddled the markings on the motorway a little longer when making lane changes today, and whereas hitting cat's eyes used to be very noisy, with a kind of 'ker-chunk' as you rolled over them, now it just feels more like a 'thump'. And I made sure to roll over a couple of manholes covers on my usual route, which I know are sunken slightly. I could still feel them, but I winced much less than I usually would after hitting them. The car just felt a little more 'solid'. So there is definitely something about the design of the Nameless bars which is transmitting less noise from the wheels to the cabin firewall, whether that be due to the mounting design, or the material and construction.
When I got home, I re-fitted the stock bars as I'm due in the office tomorrow. So I will drive the same route and see if I can confirm they are noisier compared to the Nameless ones...if I'm not going mad and still think they are, I'll swap back to the Nameless.
They are still expensive for what they are, but I would say if you are desperate for an improvement and have tried other things, they are worth a shot.