even tho dave says you can you cant.. speak to anyone ask Nick at RTech.. its not good for the engine as the standard turbo on a 1.8t is a recirculating turbo and if you stop it recirculating your losing power.. i would rather loose the sound and gain power wouldnt you ?? and no you cant map a 1.8t to run a BOV... the only way you could run one is to run a atmospheric turbo like t28 etc...