Installed on my WRX 05'. If professionally tuned, the boost pressure would not exceed 12-13 psi. My tuner informed me that those cheap MAC valves are not designed for use in cars, sometimes they work. Sometimes they don't. He told me to buy a Grimmspeed which is a MAC valve but they replace the internals with automotive quality spools and seals. Swapped EBCS and made 19psi with no problems.
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