I recently purchased a mustang with a 351 swap and a powerdyne bd11 sc on it. I have been hearing a noise only when its cold coming from the headunit sounding like a grinding, knocking sound. I just pulled the headunit, thinking a bearing was bad, but when I spin it, it feels and sounds good. It didn't have any problems making 9lbs of boost and it still whined when installed. Also, there is no damage to the impeller. Should I send it in for a rebuild or what else would you do? Does anyone local rebuild these?
