Check this link out, it says online the following:

http://cgi.ebay.co.uk/20HP-O2SENS-PERFORMANCE-CHIP-VW-TRANSPORTER-CARAVELLE_
W0QQitemZ8021052134QQcategoryZ38786QQrdZ1QQcmdZViewItem

>+20HP O2SENS PERFORMANCE CHIP VW TRANSPORTER CARAVELLE
NOT RESISTOR * NEW DEVELOPMENT * YOU CAN SELECT MODEL!\

This little chip can do almost magic with its circuit. Test Your chip
anytime to experience the result. Installation is easy no special tools or
expertise required.
You can gain +15-25 additional HP, and extremely dynamic acceleration by
upto 20 % depending on stock engine performance.
We gain additional power without any consequence in relation to the driving
comfort. Original ECU program is in process, but the signal of MAGNUM oxygen
sensor powerchip is cheating it in each microsecond delivering higher
horsepower, torque and acceleration as well. We can only feel a refreshed
engine, dynamic acceleration without terrible flat pots.

FEATURES OF MAGNUM OXYGEN SENSOR POWERCHIP:

Improves engine output by as much as 10 %.
Enhance Nm, throttle response, acceleration and low end torque.
Preserves smog certification.
Pushes up acceleration and dynamism by upto 15 %.
Results higher top speed.
Long duration - 10 years warranty.
Easy universal 10 minutes installation.
Switch can be connected in line for perfect test.
Immediate effect even during driving, no ECU learning period.
Reduces flat spots or delay time when you mash down the throttle.

OPERATION OF OXYGEN SENSOR POWERCHIP
The device modifies voltage signals, as if the exhaust gas would be
fuel-poor. ECU let more fuel to the injectors while the mass of free air is
the same. Thus we can influence the mixture adjustment gaining more power,
enhancing the efficiency of combustion and saving fuel. This add-on
simulator device delivers fuel-poor sign to the ECU, besides a limit value
control is incorporated to avoid overflow and underflow.

We improve the power slightly at the �expense of emission�.

This statement rules out California probably. I just saw this and thought it
was interesting...

-- 
Rob
NYC/Long Beach, NY
88 Wolfsburg, Silver