The problem with venting a BOV on a non MAP sensored car, is the fact that you run rich between shifts. This is caused by the ECU not recognizing that air has escaped (the air is metered BEFORE the BOV) and therefore still adds the fuel for the air that has been released, causing a slightly rich condition between shifts. If you just want a nice ricey pshhh sound and dont care about performance, then if your BOV won't leak when its vented go for it. If not then I would highly suggest recirculating it, as that is the true performance oriented way of doing it on a non MAP sensored car. For you Map sensor guys, blow off your load all you want, just not in my direction .