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Hi
BOV are a aftermarket part(standard on some factory cars)
It does the basicly the same job as the CBV on volvo turbo cars. But they mostly vent into the air. Some vent back into the turbo system
Here is a page that will give you more info on a BOV than I can
http://wwwrsphysse.anu.edu.au/~amh110/Technical_pages/blow_off_valve.htm
George
Cars I own
Restoration project
Personal import 1974 144gl B20a M40
Everyday car
1989 740 turbo B230ft/AW71
Cars I have owned
1982 244GL B23e/M45
1986 760GLE B28f/AW71
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