Hey mate, your inquiry is very broad, I can only go off personal experience, so here goes:
I have a 2013 BRZ, OFT E85 tune (full time E85), catless headers, full exhaust, coilovers, lower ratio diff.
100 000kms on the clock.
I drive it daily and compete in hillclimbs on soft compound slicks, and I don't hold back.
No engine issues whatsoever.
If I were to give any advice with regard to performance mods, I'd say only spend your money on mods with good, well-proven HP:$ ratios. The effect of a CAI is unoticeable, the effect of a drop-in filter is unoticeable, the effect of a catback is noise only, the list goes on.
Good luck, and keep us posted
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