E30 318 m40 exhaust downpipe with oxy sensor

[Silver Fox 43]

Hi, have found that it's the lack of an oxygen sensor in my exhaust which is most likely the cause of my missing at lower revs in my race car. So, I am after the front section of pipe from after the exhaust manifold to where the pipes join up to one pipe, including the oxygen sensor and wiring back up to the conector. Happy to collect and pay beers or cash, whichever . Cheers, david.