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Top tekkers. Mate who was guiding me down the phone reckoned smoke test would be what the garage would do. I just popped over with my foxwell diagnostic thing that you recommended (still going strong), and they had friends coming over so it was a very brief diagnostic sesh. And probably quite above my pay grade.
Also, reckon the smoke out the e46 is steam - I only get it off the first big acceleration, and not on subsequent ones so hoping it’s just condensation in the exhaust (and I CBA investigating further).
Check the turbo intercooler pipes they can split, if nothing is visible get a smoke test done :)