Back on topic, sadly the dreadnought, even after the improved physics (as of 188.8.131.52) still have some clipping issues on Yuri tunnel sidewalls, but i'm sure this will be solved sooner or later ^^ Oh, i'm talking about high engine power there, as I reverted back to it, since we got told that wild speed glitches doesn't really count
(btw I don't even feel that big of a difference in high-wild now)
Furthermore, the fallen debris (especially the bigass pillars), from the tower on Yuri could be destroyable or poundable to smaller particles by rockets, mines or the chaingun, or driving into them over a certain speed, because now, if someone blows up the tower, that route is pretty much killed, or requires taking a rather big hazard trying to bypass them. That applies to other static objects aswell.
I know that the cars right now don't behave very well to small obstacles, but I guess it would be a little better driving through smithereens there, and getting adrift a bit by them, than coming to a full stop, and sticking in there after speeding into those big rocks, hoping you might be able to kick some of them away so you can go through that section once more.
If, for some reason I have to go that way I usually take the flying method to avoid the rocks, taking the right side of the route and driving up on the cliffs, but that isn't the very best solution either as I often bump into the invisible walls after taking the jump.
On 8 lap races they can become an even bigger problem, as the debris' bigger parts often gets pushed into the tunnels by others, plugging them.