Hi! I have the V70 Bj 1998 with the 193 hp 5-cylinder turbo engine. We have changed the control unit and it now brings 0.9 bar charging pressure. From the trigger it goes totally well, does not go worse than my Audi A8 with 300 hp, which I had before. Now I want to install a Pop Off. An acquaintance has the same Volvo with the same engine. He installed a Pop Off last week that absolutely doesn’t hiss. It works on etc. – but you don’t hear anything. He installed it on top of the idler by means of a T-piece. It’s not on the valve, a friend had it previously in the Audi S4 20V Turbo where it hissed damn loudly. Is this installation place right or where would you recommend that you install a pop Off? Thank you! LG Peter