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Why don't you just tap it out to 12 mm metric fine ?

I can get oxy sensors that will be plug in's for around US $120.00 , freight won't really be an issue as I have stuff coming over all the time , got a pair of alloy 4 pots arriving this coming week followed by a compressor and then some more 4 pots , also need some precat oxy sensors myself .

I'd say too big !! A single 3" pipe can carry 600 HP !! You might be in for a drone type noise , are you running a tri-y each side ? Just remember that each side is only 2 litre's , have a look at some performance 2 litre extractor systems and see what size the 4 into 1 merge pipe diameter is ...

I'll talk to my guy in the States about genuine plug in , I get everything else at a third the price so wouldn't expect oxy sensors to be any different .