Here's the catch can installed on my 323 GT-R. There are two breather pipes fitted on the GT-R, one pipe which goes from the end of the rocker cover to the pre-turbo intake hose and a second one on the back of the rocker cover going to the inlet manifold. The hose on the intake must be blocked, and then a hose routed from this to the catch can. For the hose on the intake manifold, again, block the hose at the manifold, however there is a valve fitted, which only opens under vacuum on the rocker cover end. To ensure the best system operation, I have removed all the insides from the valve, so it acts just like a hollow connection tube.
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