few months old info:

My name is Ken Nunn & I am the General Manager of Harrop Engineering in Australia.

We manufacture superchargers - both twin-screw and Roots. We have been doing so for many years, and can say with a lot of confidence that the TVS-based supercharger is very impressive. We build TVS-based products for two OE-ish companies: TRD & Roush. Before choosing the TVS units, both companies did extensive & independant back-to-back testing which resulted in both companies being convinced that the new TVS-technology was worth the extra expense.
In the TRD test which I observed, the TVS1320 produced more boost at a lower temperature with less input power required (parasitic loss) than both the 1200 twin-screw and the Eaton 5th-gen M90. It was also quieter.

We have just completed the tooling for our generic TVS-based range of superchargers. The initial release is know as the HTV range (Harrop Twin Vorticies as TVS is an Eaton-specific trade-name (for Twin Vortices System)). It includes the HTV1320, HTV1900, HTV2300. All are availble in a range of mounting options and input-shaft lengths. We use the HTV2300 on Chev LS1/2/6/7 & L76/92/98 engines. The HTV2300 can support 1000+ HP on an LS7 ... as done by GM-Performance/TA-Engines in a Solstice!

Also ... and the reason I have joined this forum ... is that we are currently completing the design of a HTV1320 bolt-on upgrade to replace the old M62. We have no intention of doing a "complete kit" (we will leave that to your local experts). Our solution is an HTV1320 supercharger that is a direct bolt-on replacement for the Cobalt SS M62. It has a pulley supplied on a hub for easy changing, and has the OE integral bypass assembly included.

It is our intention to have durabilty testing completed by Christmas, and the production release available in January. We are not a sponsor, so it would not be appropriate for me to indicate pricing or distribution ... but you guys can always make suggestions

 

I've seen them active over on the GTO boards a lot...not many US people are running their setups though because it's an Australian company and the exchange rate sucks. Good to see that the TVS is out somewhere though, even though Magnuson hasn't released it yet

 

What I found interesting was the comparison to the twin screw setup

 

Yes, that was good info. Nice to see the OEM's recognize the superiority of the new design. I'm excited to see where TVS takes the supercharging world....things are gonna be changing for the better So much for the "roots-type superchargers are inefficient" argument.