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[aaronjb]

Pretty much all the rolling road folks do it post CAT - from what I understand you just need to 'adjust' the figure you're looking at as it looks constantly slightly leaner than it really is.. oh and slower to respond I guess.

I guess it's easy enough to swap it in place of a factory O2 sensor; given you're already messing with the wiring doing the LPG kit, just find the relevant wires into the ECU and splice it in with a suitable connector.

[Gaffers]

Remember on the AJ16 there is 1 cat pre lambda and another further down the exhaust, will that not affect taking the reading at the tailpipe?

[Kevin Wood]

The second lambda won't make any odds, but measuring after the cat won't give you a true picture of what's going on.

[Kevin Wood]

That said, the cat will not be doing a great deal at full chat. Most of the exhaust gas will go straight through, so from a point of view of being able to compare the situation on petrol and LPG and adjust accordingly, it might be good enough.

[Marks DTM Calib]

Trouble is that those transient lean periods wont show up post cat as it effectively 'smooths' the response.