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It will void your warranty. However the tune question is debatable, some say yes you need a tune and some say no.
I personally had a Roto fab CAI, 2.85 pulley , long tube headers and straight pipe, no tune and it ran great!!!
But without a tune you will get a cat inefficiency code from the 2nd O2 sensors, that won't effect performance but the light is annoying.. most people have that code tuned out.
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2012 ZL1 preproduction car #13
ROTO-FAB intake / IC reservoir , 2.85" upper , ported inlet |