I have found a couple of repair fixes if people are wanting to tune like myself. The first is the Vargas bolt capture http://performance.vargasturbo.com/...oute=product/product&product_id=83&search=S55 I’ll be honest I’m not sure how much this will help as I don’t think it’s the bolt coming loose is the issue, I think it’s the stalling on the vibration damper during kickingdown or high rpm gear change that causes the whole hub / damper shocking then undoing itself. Surely the bolt capture would just undo with the crank hub / damper plus potentially worsen the issue by adding weight (small amount I know). If it is just the bolt that loosens then it could work. Next fix is this http://gintani.com/product/gintani-f8x-m3-m4-one-piece-crank-hub-solution/ bloody expensive and I wonder how strong the keyway is. Also it’s a big job and if your not technically minded you would need to shell out a fair few £1000’s to sort an issue that might never happen. Would be good if a tuning company in the UK could start offering a fix for the issue or even a package deal like decat, filters, stage 2 and crank bolt fix. Just an idea... Evolve?