Likely the MMC quoted 280bhp although many unmodified ones made a little more on the Dyno without the ECU upgrade that John V6 mentions.
Engine plate of my August 2018 build FWIW.
![[Linked Image]](https://i.ibb.co/zT7jnvP9/IMG-20260624-163800.jpg)
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I believe the ARV6 run used different spec engines with solid flywheel rather than the normal DMF.