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Still waiting for specific GU under bonnet pressure results from @rainsey across in the 'Chev' thread. He kindly on behalf for all bought a 'Manometer' to approve/disprove some theories on scoops, TM iC's/FMiC's etc... Blokes been super busy so no pressure, pardon the pun, Graham :-) Here's his Manometer: Here's the charts awaiting his return and testing: Scoops, holes in bonnets can either work great or really bad ;-)