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I pretty much use my car like you, have the 3.91 gears and am in the 460 rwhp range. I just did a straight gear swap - didn't upgrade any rear diff parts. I've had about 3K miles of trouble free use including a few hard launches and a couple of 1/4 mile runs - all good so far.
Certainly upgrading wouldn't be the wrong thing for you but I deemed it not needed for my use.
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2016 Camaro 1SS Hyper Blue 6MT NPP
2010 Camaro 2SS Cam/Headers/CAI/3.91 gears
476 rwhp/440 rwtq (sold)
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