Who has experiences with tuning chips for the small turbo escos?
Which are good, which are not?
I see on ebay for example this chip,
from the advert on ebay:



For Escort Cosworth Small Turbo
EEC Management


Please note a -31 actuator will be needed with this chip to get the full potential out of your car - these are in my other items!!

Escort Cosworth Small Turbo Chip- +40 BHP (when used with actuator)
Retails at £293.75

Enhance the performance of your car with an easy to fit, tried and tested 'Powerchips'. Our chips are correctly mapped by the masters of going faster, 'Powerchips'! They are mapped to increase power and torque, make your engine more responsive, remove flat spots, and generally makes the car more fun to drive.

When driven sensibly, not only does the chip improve performance, it can also improve fuel economy, rather than destroy it, unlike when you use a cheap resistor 'chip'. The other 'chips' offered on eBay, fool your car into believing it is running on cold start constantly, making your car run rich all the time and hence BIGGER fuel bills!!

How can I check if this is a real chip, no imitation with only a resistor of 5 cents in it

What chips are ok?

Thanks!