Are you definitely sure it doesn't have a lambda hole?
Quote:
CENTRE PIPE OPTIONS
The Saxsport centre has been designed with a dummy cat silencer near identical to the Peugeot Sport Rally Team original exhaust system.The only difference is that the Saxsport dummy cat has a threaded hole to fit a lambda sensor.
Later Saxo VTSs which have three-plug ECUs and L4 emissions control use two lambda sensors and have an EGR pump fitted, part of which is bolted to the front of the head. These are usually 2001 onwards, so beginning from Y-platers. On these models, you need to cater for the second lambda sensor that fits into the standard exhaust. There are two different options for these models when fitting a Saxsport:
> Use a lambda sleeve and mount the lambda in a suitable position
> Fit the Saxsport motorsport catalyst centre pipe that has 2 lambda holes.
If you fit a lambda sensor to the decat centre pipe, there is a possibility of the engine management light coming on, due to the second lambda detecting “dirty” air straight from the engine, rather than passing through a working catalytic converter first. If you fit the cat pipe or use a lambda sleeve, then the warning light should not appear on the dash. Please note that the cat pipe should pass an MOT but the decat centre pipe will most probably not.
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Only their website seems to suggest that there is a hole for a 2nd lambda?