https://www.ebay.co.uk/itm/Aluminium-Shroud-Fan-For-Nissan-Datsun-240Z-260Z-1970-1975-Engine-Cooling-1975/152925446309?epid=4013958715&hash=item239b1120a5:g:wpYAAOSwhqhaFm~u So how does this work 35% better then ?