I called Magnaflow today and asked about the "break in "period. Yes, it will get some deeper volume in time. The muffler that was made for these models, was meant to be an OEM REPLACEMENT, so sound was not a priority. He suggested to wind it out at highway speeds and move the packing around for the next 400 or so miles. I was disappointed that a company that does advertising for performance cars would sell something that you can get from a Midas shop. 
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1991 FORMULA 350-GONE BUT NOT FORGOTTEN
1 of 1,197 with L98 Option/13.79@100 mph
1994 25th ANNIVERSARY TRANS AM GT -1 of ONLY 2,000 made/ Only 128 made with a HURST 6-Speed Manual and 91 with T-Tops and Compact Disc/ K & N Filtercharger/Magnaflow Performance Muffler/Air Foil- ORIGINAL MINT Arctic White Ultra Rare SURVIVOR. DAYTONA 500 PACE CAR Decal Kit!
SOLD: 1989 Turbo T/A in 1991 it ran 12:18@115 mph
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