Under heavy accelration I recently started getting a serious rattle noise from the engine bay, like a dud turbo. Few people said no a problem. So I finally got round to jacking it up and getting the under tray off. IT WAS A B**** STONE IN THE UNDER TRAY! AHHHHHH this has has given more than 1 sleepless nigh I can tell you!

its done well that stone to actually get in the undertray , its pretty well sealed up

its done well that stone to actually get in the undertray , its pretty well sealed up

And it stayed there even through a service! Still my try is largely held on with cable ties due to speed bumps!