Can you swap a 92 vw passat 16v DOHC engine into your 86 vw cabriolet If so what parts will need to be changed?

Yes, you can swap a 1992 VW Passat 16V DOHC engine into an 1986 VW Cabriolet, but it requires several modifications. You'll need to change the engine mounts, transmission, and possibly the wiring harness and ECU to accommodate the newer engine. Additionally, you'll need to ensure compatibility with the cooling system and exhaust setup. Fuel delivery and intake modifications may also be necessary to complete the swap successfully.