My HFCs had some nasty rasp for the first week or two. It settled down tremendously after a few heat cycles. Now I have a hint of rasp when listening outside the car if things are cold. On a hot exhaust, I only get compliments on the sound. Give it a little time to settle in. If it's still bad in two weeks, call ERZ and complain.
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2013 Cadillac V-Wagon, RIP Z
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