AIRTEC Focus Mk2 RS 50mm core all alloy radiator upgradeThe Focus ST & RS Models have been massively popular and tuning of these fast fords have been taken to amazing new levels, unfortunately the cooling radiator has always been a weak point, this is where are AIRTEC alloy radiator comes into play. We tried a 40mm core and where it worked well but on track we could still see improvements were needed and so we opted for a huge 50mm core 'normally found on our Cosworth radiators' it was perfect! but due to