I fitted a manifold twin Downpipe to original cast 3-2 port manifold on the late (from 1990) Mini Cooper and MG Metros when using HIF44 carburettors.
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I first smeared the joint faces with a little exhaust paste first. I think this was a fitting mistake, what do you think?
You see I have a slight leak there ate idle - (according to the sound) in spite of careful fitting. I noticed even with the clamps tightened to max, the down pipes could swivel slightly when twisting the lower connecting y-piece - probably no big deal, but have seen tighter on other exhaust systems.
John
