But I think the OP is questioning just a tune and intake. Those ET lists all show stage 2 or 2+ mostly and leave out many details such as slicks, weight reduction, E85 tunes, race fuel or not, and water-math injection. Just a stage 1 tune with an intake or drop-in performance filter on street tires is likely to only result in a low 14s 1/4mi ET.
No one should ever expect their car will be the fastest of all others when doing similar mods. I've talked to many guys running stage 2 and 2+ tunes running mid 14's when ever I was at the track and I never saw any MK5 with a K03 and tuned ever making a 13s run while I was in attendance here locally.