Some Monte wheel 'chops
I've got 20s and my ride is at least as good, if not better than, stock (thanks to the Kumho tires).
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06MonteSS / DiabLew Tune

2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Yes, technically, 20s will slow you down a bit due to the rotational mass of the wheels. Now, if you found a "performance" 20 that was lighter than the OEM wheels, you might negate this issue.
Now that I look, they are pretty big without a lot of rubber. I'm working on some other ones that are slightly smaller. All wheels except for the TTII's are from iForged.
Meanwhile....









