no where that I know of has a rotrexed VX on the road as yet. I'm sure there are a few in the pipeline though as its pretty much a DUHHHHHHHHH option over the hEaton.
So it wont be a simple drive in drive out option at the "tuners" yet.
When i was visiting Komo-Tec in Germany (near the Ring) a couple of years ago for an A048 puncture repair, they were just finishing their first NA VX with a custom Rotrex Supercharger set-up.
I saw it with the Clams off, and it all looked incredibly tidy and efficient.
They used a custom lightweight front-mounted chargecooler for the set-up. Similar to their elise S'charger set-up.
It all looked beautifully crafted, and lightweight.
I was planning to go for this myself, but it is now 7000+ Euros, and Euros are erm, strong at the mo.
When i spoke to Daniel there about it, he said power was 'good'.
(They also install a custom Turbo set-up for the 2.2 VX)