According to your mechanic that is fitting the kit, what is the maximum power that the twin T2 turbos could achieve under full boost and what boost pressure would this be at? (I'm assuming the same turbos are used for all three engine types)
One tuning specialist that saw the kit said the turbos would only be good for 220rwhp (in total) without overspinning them. I don't see how this is possible if the E320TT makes 345bhp (~270rwhp). Surely Turbo Technics wouldn't have pushed the turbos beyond their recommended redline when they designed the conversion.

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1989 300CE "Project HWA124"
(400rwhp Turbo Technics AMG C36 engine)