As JB1 stated above, the exhaust will settle down with time. He was there the day I had my HFCs installed (CBE was already on the car). We drove off for the first time and we both cringed...the rasp was ungodly. I'd say it took a good 2-3 weeks for things to really settle down. Essentially, you have to heat cycle the exhaust a number of times and the rasp will diminish greatly. Especially at the end of a track day when the exhaust is scorching hot, I think it sounds pretty wicked and almost no rasp.
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2013 Cadillac V-Wagon, RIP Z
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