| From an email from Greg about this subject: The stock recirc's are very strong. We have run them at 30 psi without a problem. I have tested the stock recirc's off the car with 50psi pressure on them and they do not leak at all. Blow off valves are very hard on the engine because they cause the ECU to open the injectors and pour in raw fuel every time you hear the Psssst sound. Every Z that I have seen with blow offs installs very long has oil burning issues and has raw gas in the crankcase. When ever you change oil on a Z with blow off valves the oil smells like gas.
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