IMO, it's about 1/3 less loud.
That said, my Borla had seen better days, it was cracked @ the front flange, welded, then cracked again in the same place, so that was adding to the db level, as well as "cracking" during decel. As noted earlier, there was a definite rattle inside the body of the muffler, also, when I removed the "strainer" from the stock tip, some old/carboned up batting fell out too...so much for the "million mile warranty"...
Now, I can hardly hear any exhaust note on decel.
Overall, it still has a healthy note on accel, just not as much, & I kinda miss that...
Also, I found some real dyno charts(hopefully impartial) that showed a significant bump in both HP & torque, something I never found for Borla.
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