I picked up a set of extractors off an XH they look the part just messy welds on it etc.

it has cat and flange etc welded onto the extractors.

My question is since it is complete should it bolt straight upto the AU flange on the exhaust system on my AU. Or will I have to get it cut and shutted to fit etc.

providing both flange points where the cat joins the exhaust is in the original spot, then yes it will fit..