Quote:
Originally Posted by //TMT
The M35i doesn't really have a downpipe. The catalytic converter is small and bolts directly to the manifold. From there, it's just tubing going back.
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My 335i didn't have a downpipe either, until I removed the cat and put one in. I don't see how this is different. Why would the cat/downpipe bolting up to the manifold make things so different? The downpipe would just be swapped in as-if you were replacing the cat.