I have just bought myself a lovely 4 branch manifold for my 2 ltr Zetec, it comes with a Decat, and has the bosses for the lamda sensors... It looks the nuts and the build quality is top notch. BUT on no2 downpipe there is small diameter pipe that is approx 20cm long and comes off at almost a right angle, the end of the pipe is externally threaded. I cant work out what is supposed to attach to it (if anything). Anyone got any ideas?