As I replied to a few other BCS Powervalve owners in PM's, mine was the first one fitted (
) and yes my Pipe did come off, the pipe was clipped onto underside of car and then a Jubilee clip added to hold it on, it has not come off since (touch wood).
My ED30 has a Jabba stg 2 Map and made 316hp and 342lb/ft, it made 297bhp at R-Tech on a scorching hot day (in the mid 80's) and the Powervalve pipe had come off, it then went back to Jabba for tuning for DSG remap (R-tech) and it made better figures, but fuel pump was holding it back to that