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2012- 15 Camaros have the LFX engine (2010 - 11 have LLT) which has integrated exhaust manifolds (built into the cylinder head), so there is just a pipe bolted to either head rather than a manifold. You'll get a different sound with long tube headers, for example, but otherwise with any given mods you'll get a similar amount of power from either engine. A full intake, exhaust, tune will get you around 300 HP to the wheels.
The LFX also uses a plastic/composite intake manifold which soaks up a lot less heat and would be much better if you're racing, but I believe the LFX manifold fits right on the LLT (not 100% sure though off hand).
A catch can is recommended because these engines are direct injection and thus the fuel doesn't keep the intake valves clean (like port injection). Due to the PCV system the intake valves tend to get coated with oil and a catch can will reduce (not eliminate) how much oil the valves see.
Your best bang-for-your-buck option for speed/acceleration would be a 1LE rear end (3.91 gears vs. 3.27), but you'll have to find one used.
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Overkill/Self Tuned; Mace Camshafts; K&N Typhoon Cold Air Intake; Ported 80mm Throttle Body/Intake Manifolds/Manifold Spacer; Solo Performance High-Flow Cats, Cat-back Exhaust; Vitesse Motorsports Throttle Controller; Elite Engineering E2 Catch Can; BC Racing BR Coilovers; JPSS Delrin Radius Rod Bushing Inserts, Sway Bars; Pegasus Aluminum Rear Cradle Bushings, Camber/Caster Plates; Z/28 Toe Links, Trailing Arms, Upper Control Arm Bushings, Rear Shock Mounts
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