Right my first problem in turbo ownership, yesterday i got round to fitting a bailey dump valve and de-restricted the airbox at the same time. all was fine last night, drove round normally enjoying the sounds of my first mod but tonight its all gone a bit pete tong. was giving the car a little stick and all of a sudden there was a strange noise when the turbo came onto heavy boost, like the dump valve was sticking and blowing air out, then the engine managment light came on pulled over to check if any pipes etc had come loose but nothing obvious, got the car home and will have to wait till tomorrow for a good check. has anyone got any ideas where i should be looking or what could be the cause? the dv was working fine on the way back its just the noise and the drop in boost that i have to go on.