I happened to luckily discover my lower boost pipe, which you cannot see unless you remove the under tray, while changing ARBs. The clip had broken and I reckon it was ready to pop off at any moment, luckily I always keep 322564 spare of those crappy C clips in my box!

I also found this with my mums, she had been driving it around for a week complaining of juddering under acceleration, I looked, the pipe wasn't seated correctly and venting some of the air out where it was half hanging out!
