I have a friend who just got a greddy bov and it has two vaccum sources. Most BOV's I've seen usually only have 1 so whats the other for and what does he do with it?

 

The top nipple is your vac source, either fpr vac line or brake booster. The bottom nipple stays open, I have heard you can run a line from the bottom nipple back to the intake charge piping. This helps with spool up, I guess.

 

THanks for the fast reply.

 

No prob