Ihave greddy eo1. The diagrams online show for external wastegates u must use all 3 vaccum ports on controller. One comes from turbo in. One goes to top of wastegate. What exactly do i hook this last port to, just a extra vaccum? Some of my boys said the third isnt neccesary. Let me know some off yall experienced e01 users feedback. Thanks Nick

 

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I know someone on here is usuing or has used a greddy boost controller before

 

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have you tried the instructions? I've found them to be helpful when installing parts.