We had a customer a with a Supra put on a fake HKS BOV once. He was adamant about not spending the extra money. 1 hour later he calls me telling me that his car is running really rough. Brings the car back and after 30 minutes of trying to figure out WTF it was, we notice the fake HKS BOV valve was missing
. End of the day, he spent money buying a real one + labor + loss of $60 for the fake one. Granted this was maybe 3 years ago so China's quality control might be better now.