The AGP block off plate came out in 2004, fast forward to 2012 and we now have a second choice of block off plate available.
For those of you wanting to install a HKS, Greddy, TurboXS, Synapse, etc blow off valve on your car, you’ll need to seal off the factory surge valve port.
Thats where this item comes in. This blocks off the factory port and allows you to use a different blow off valve.
What makes this one unique, is that the AGP block off plate uses RTV to seal it to the turbo (which works well) but the Synapse block off plate uses rubber seals to seal to the turbo surge valve port better. This allows for better sealing and resistance to higher boost pressures.
Link for more information/pricing.