I think our 09 models are the last year that GM had that they could not map tunes. Now I think 2010 Camaro's actually falls into this issue of being able to tell if and when it's been manipulated (don't remember when I heard this but it's been a couple years ago). As long as you haven't opened up the engine (no cam) I think a lifter failing is a mechanical defect from the factory that would have nothing to do with a tune or headers. Just be sure to get the stock tune from Pat G.