Hi. I recently changed my mbc and stupidly forgot to check it was wound to minus. Put my foot down. Far too much boost. Now it sounds like it a noisy tappet would sound. It drives fine just has a tapping sound. I used engine flush and changed oil. Only halfords 10-40 semi because money was tight. The sound has quietened down a little but still there. Definatley a top end tap. Sounds like from the back cam. Any ideas??? Thanks. Matt.
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