Lotus' idea of "designed for street use" is a little different than say, Ford or GM. So is their definition of "dramatic gains", I suspect!

And it's not so much of a noise you will acquire, rather a squeek... like every time you hit a bump or expansion joint in our silky smooth NC roads

Squeek squeek squeekity squeek (yes, I know it is supposed to be squeak, but this is meant to be a more shrill.) The good news is, it will sure tighten up sloppy handling!