Hi guys I have been searching through endless post to find how best to plumb my GM 3-port BCS while using an External Wastegate. I would like to know which way gives the best boost response and if both the top and bottom ports are used . THanks for your help in advance

 

here you go

 

thanks allot . What are the disadvantages of not connecting the Port A on the GM to the top port of the Wastegate?. Would my spool up be slower?

 

Has anyone else done any ecu controlled boost with External wastegate testing with vacuum plumbing?