I have a question about the supernow block off plates guys. The one in the middle shown in the picture, what is it for? It has an 1/8 pt hole in the middle. Is it to attach some intake sensor maybe?

 

Could be for the Coolant passage to the turbo on the JDM LIM. Looks too big though. I installed block off plates on a JDM manifold last week. I think that's the plate that goes on the UIM actually. The 2 smaller ones look more like the coolant and split air pipe block off plates. Maybe they put a hole there as a place for MAP readings? Not sure if thats a great location for it though, never seen anyone tap there.

 

On my s4 T2 LIM the coolant passageway for the turbo used a split-air blockoff plate. The two blockoff plates are exactly the same. On my new s5 JDM LIM it looks like the coolant feed is the same shape.

 

When I got the plates I thought they were going to send me the obvious three ones but they were 4 and I thought I should ask if anybody is using them on there fc. I guess I will find out were it goes when I will install them :-) On my other TII that has block off plates, (different company) i did not use something like this. I got a little confused when I saw the one, with what it looks like 1/8 PT hole thread. I thought maybe is to install a nipple with a vaccum hose attached to get some vaccum readings. What about the bac valve? What are the dimensions there? Maybe I will check one of my bac valves when I get home to see...