Derv doctor dump valve

[Chris_90]

will still lose boost on either, youd notice the loss as it wouldnt keep pressure on lda pin

If it was switched off would it still loose power with it fitted or only when the solenoid is switched on and the dv is active

If you had it to a switch you would be fine if its switched off as it will be holding all the boost in the pipes, To be honest im thinking about getting one and doing the same as you so its on a switch, only as im still a little boy inside making noises baaaarrrrpppp tissssshhh

But as cj said they will make your car slower when you have it switched on