Well, I have the car parked for winter, so thought I bounce a question to the forum. I installed the 4 port HVC that most GTM owners are using(NAPA Part # BK 660-1293) and it has been leaking out of the rod that is connected to the vacuum pot and butterfly valve. After doing some research this can be a problem with this inexpensive plastic valve. I am now wondering if there is a better 4 port valve out there or another option as this valve only lasted 3 years. My other option is to just put a stop valve in. Since I am tearing the car apart to replace the drive by wire harness and TAC module, I can easily fix this as well. Any thoughts on a better solution?