I have got a bailey atmospheric dump valve on my uk turbo i have had it for a while and think of getting something like a forge recirculating dump valve i cant find the standard one must have binned it what do the recirculating ones sound like? any advice will be greatly appreciated i have heard that atmospheric dump valves can be bad for the engine cheers

 

They sound like the oem one mate (ie no noise at all)

 

My OEM one makes a noise. You simply have to remove the air intake silencer and ram-air scoop and fit a decent free flowing panel