Too good to be true?

[kinghorna]

http://www.superchargerswarehouse.com/howsuperchargerswork.html

Anyone used this?
Anybody have views on this?

The logic seems fine but surely not for that price

I have a 58 plate a3 (8P) TDI 170 quattro

[Crasher]

Ohh no, not that one doing the rounds again!