That's exactly the point. Except when you get it installed and it's really not. You start thinking, ok maybe its faster and pulls a little harder. If they actually installed it obviously it's night and day different.
Like I said before, I'm sure there are people driving around thinking they have it installed and don't.
With that being said, I'm sure if they did do a software upgrade and did not re-install the dinan you would instantly know.
Dinan Stage 3, 22" Agetro rims, H&R sport springs, RDsport front lip, coded, paddle shift retrofit, AlpineMSS HID 8000k. All exterior chrome, roof, roof spoiler and everything behind wheels painted black, wing, side and rear reflectors and door handle trim painted white, light smoke on tail lights. Audio: focal separates, earthquake low profile subs under front seats (crossed over as mid base to support the pathetic 4" fronts), arc audio amps, audiocontrol lcq-1 and epicenter, (2) L7 subs.