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UD pulley, and clutch and balanced. I don't see what the big deal is. Yeah alot of things in theory will cause problems. For example running higher boost means hotter engine temps, and stress and therefore less engine life. Performance is a give and take sitaution. You give up a little to get something else back. UR has sold thousands of UR pulleys for all sorts of cars and how many do you know of who had rod bearing wear because of that? Yeah the stock UR pulley is safer than lighten UR pulley. But so is running stock boost.

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