i was a newbie to forced induction until march this year, to save you getting a "do a search, yawn" response i'll tell you now, on the VAG 1.8T motors D/V doesn't stand for dump valve it stands for diverter valve. atmospheric valves dont work on these engines as the excess boost goes back into the intake via the turbo intake pipe between the airbox and turbo. there are hybrid valves available that are both recirculating and atmospheric but from what i've read these still throw up faults. you have a D/V as standard but it is a plastic bosch version and from reading you're previous posts t won't be long before you start modding and the original valve tends to split if you up the boost. i've done a few mods to my LCR that i thought would be better to do before i get mine remapped (coming soon hopefully) i've got a forge 007p D/V, forge silicone TIP (turbo intake pipe) and forge top intercooler silicone pipes plus a raid/ramair induction kit. with all this fitted it sort of sounds like an atmospheric D/V anyway