In some instances the difference is very noticeable, in others not so much. It depends on the degredation of your current seals. Also, these seals are not something that BMW officially acknowledges. So that is not covered under Inspection II.
P46 Projectors + FX-R Retrofit + 6k D2S / 60 LED AE's / Smoked LED Tails / Smoked Turn and Side Markers / BSW 10" Sub /ZHP Knob / Matte Black Grills / DICE / Parrot + Connects2 / OEM Alternative Alarm Mod / Clutch Switch Delay Mod / M3 Rep Front Bumper / 3M Black CF Di-Noc Wrap / K&N Intake / 35% Tint All Around / Black Short Eurotray / 545i Shifter