Ok, I have seen this discussed on here many times but never saw a solution mentioned; so instead of contributing to somewhat trivial threads that seem to go in circles... I will talk about a fix here. I am NOT a master mechanic or specialist of any kind but will try to pass on the research I have done and would encourage you to verify this if you decide to try.<p><br>The R does not have a BOV per say. the R recirculates the air and if you impliment a BOV you will through a code from the air going into the atmosphere and not goinng back through the cycle.<p>An Upgrade for the R is a Diverter valve. I have not found any on the volvo aftermarket sites but <A HREF="http://www.gmpperformance.com" TARGET="_blank">http://www.gmpperformance.com</A> has several to pick from. If you go to the site - engine(in the far right column) - to Bypass/Blow-off Valves and there are a few to pick from. One of them looks just like the oem one but it metal instead of plastic... for you "sleeper" guys. The dealer will not be able to tell this one is there. Is this needed? no, prolly not... but it may help smooth out boost levels and get boost sooner. <p>Anyways, go to <A HREF="http://www.gmpperformance.com" TARGET="_blank">http://www.gmpperformance.com</A> and read through some of the "sales pitches" given for the different diverter valves and that will give you a good idea.<p>For you guys thinking of going with a bigger turbo, an upgraded/bigger Bosch one will be needed at a minimum. This one is plastic and is a comon valve for the 944 cup cars but is plastic and will not last forever. the mentioned valves may be the right fit depending on the application.