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Intakes: (there is a mixed debate if these make more power, so far no consensous. However, they do sound great.)
DIY: Write up on Jet Fuel Only
ZZ Performance VSport Intake
Install: Video on Jet Fuel Only
K&N 33-5028 Reusable Drop In Air Filter

There really is only one plug that everyone recommends, even if you are stock:
NGK LTR7BHX/95605 Ruthenium HX gapped to 0.027 inch (much less than factory gap)
Install: Video on Jet Fuel Only

Downpipes: (there is a mixed debate if these make more power, so far on consensous. They do change the exhaust tone and some report it's more raspy)
Currently unavailable, inquire with ZZP (they make cat and cat-less versions)
Video/Soundclip (catless) with magnaflows

Blowoff Valves: (again mixed debate, they add some sound though if that is your thing.)
Weapon X Motorsports Turbosmart Compact Blowoff Valves
Install: Video on EZ_E89's channel

Turbo Upgrade to ATS V: (This is currently being down now, without a tune at most you get just faster spooling)
Old GM Part#12666536 Right and GM Part#12666537 Left.(discontinued due to turbo rattle)
New GM Part#12673347 Right and GM Part#12673348 Left (add spring kit to ensure no turbo rattle GM Part#12686941)
Up pipes to match with ATS V turbos: GM Part#12653209 Right and GM Part#12653210 Left

Axel backs:
Pre-2017 VSports Only, Corsa 84163935/14325
Video/Soundclip on J Teri's channel (shows with quads and without)
2017 and on: Corsa 84015419?

Universal Mufflers:
Magnaflow 11236, 4x9" Oval/offset outlets
Video/Soundlcip on J Teri's channel (with quads)
Gibson MWA (Muffler with Attitude): need the part number still. 2.5" inlet/outlet

Other mods not tried (mostly from the ATS V):
Fuel Cam (raises fuel by 30%)
ZZ Performance E85 Conversion kit Manifold barrier gaskets (allow for less heat transfer)
Radiator/Electric Fans
Boost Chiller for intercooler
Meth Injection
Transmission cooler Upgrade
Heat Exchanger Upgrade
Catch can