Like everyone has said: Intake, Exhaust, Headers, & Tune.
Those tend to be the default "go-to" things that everyone does and benefits the car in all cases.
Mine also came with a K&N Blackhawk intake and it works alright, but I'm looking at switching out to a CAI one.
Long tube headers wake up the LS and are pretty much a "must do". You will need a tune to get the most from them and especially if you delete the cats.
If you want more volume, get yourself a cat-back exhaust system. Plenty out there!
Another simple and cheap mod would be a oil catch can.
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2013 1SS/1LE
Corsa Extreme cat-back, Speed Engineering LT Headers with black ceramic coating, C7 Z06 Front Brake Upgrade, Mishimoto Oil Cooler, BMR Tunnel Brace, Mishimoto Oil Catch Can, MSD Plug Wires, Mishimoto Radiator and Hoses.
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