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I said, "sounds alot meaner than it is" b/c the car that dyno'd before me had H/C and an ATI ProCharger, was much much quieter than me, and laid down over 500 at the wheels.
I changed the catback out from Borla stingers (straight-through mufflers) to Borla straight pipes (no mufflers at all). No difference in power, just sound. I sold the straight pipes already and threw my stingers back on. It's now in tolerable decible levels, but still loud as hell at WOT.