negating one's previous comment, opinion, etc.
I tried to run without it because I removed it to clean the valve. The engine braking was certainly eased when I ran after installing it again. But the price is still a problem. The price is still a problem. It is a normal One-Way Valve, so you can make your own for half the price. I took it off for cleaning after 4,000km from installation, but I don't think you need to maintain it if you drive everyday.
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