
Judging by the description this is another variation of the resistor modification to make it run richer.
Guess it may allow more fuel to be pumped in right across the rev range and at all loads, but no way would i fit one of those to my car!!! Guess it could throw out emissions, ruin the cat, ruin driveability etc etc etc
don't expect to get through an MOT with that on....
What a dumb device, as ^^ the cat won't work, your plugs will soot up and its just like pulling the choke out on a carb car
[Edited on 12/3/09 by Mr Whippy]
Another "Snake Oil" type of product.
I wouldnt fit one.
Best way is to remap the ECU if you can.
Or... Fit a Megasquirt... then you can play to your hearts content.

Yeah,
Noticed this today as well.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120390555170
You can buy them for £117 new from triggerwheels, which is apprently where the seller buys them from himself!!
Daniel
was about £ 50 last year when £ was strong vs $ 
I paid £50 for mine from the states (in kit form)