This is the popular GTX PCV valve being used to replace the factory PCV valve on the 90-05 Miata. With a more robust metal housing and internals they prove to function much better than the OEM PCV which was not intended to see positive pressure form a forced induction system. Will require some very slight modification when fitting to a 99-05 Miata.
Came in quick. Simple installation and pretty straight forward. Great price for it as well.
Holds 16 PSI without any leaks, I have no doubts it would hold more. Great construction.
Installed on my 02 NB VVT, no modifications were needed, OEM fit. Noticeable different in pressure stabilization, old valve was probably on its way out.
Awaiting last bit of turbo kit before putting it to the true test!