I just checked Midnights site as well. I’ve heard highly of his work for many years here and even if not 18 I would grab. Pulley kits do work. There are some larger throttle bodies for the M44 still floating around on used sites but I don’t think they offer much. Are you already running a different exhaust?
If you do get the tune and pulley it would be interesting to see what yours makes on the dyno.
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