That flywheel conversion makes no sence to me whatsoever lol. You cant gain power through your propshaft and diff
With an 18% power loss through transmission drag you would run a wheel figure of 362.85bhp.
That is still an awesome wheel horsepower figure and flywheel figure though.
Unless the Rolling road operator has got confused and that graph is the wheel figure like on most rolling roads. Ie they worked out that figure to be the wheel figure off the flywheel. the graph states otherwise though