just thought i would check something, and indeed i was right, where the lambda boss, are situated on the escort exhaust housing the sensor would foul on the head due to the 2wd manifold and the angle it put the housing at. bugger.

oh well least i found that out before i had the housing drilled.

guess its gotta be a boss welded on the downpipe then, will get the car running and then drive the car somewhere to have the boss welded on rather than start taking bits off again