if anything, you should see if the suspension geometry is changed, with the spacers, with the lowered or raised ride - the germans are very meticulous in their engineering, and design things with certain consumer in mind. once you change the geometry beyond the included tolerance level, you put increased stress onto components that may not have been designed to take the load, and you might need to swap out the itme to accomodate the changed geometry. when the ride is lowered using the airbags, they, rubber by nature (special compound) might not like being stressed in a compressed condition. some folks opt oout into different suspension items, that were designed by the aftermarket designers to take the extra beating. just remember, that the iS is slightly different in the suspension design, that the regular E53...

The xoutpost is a more mature forum and many members here are also members elsewhere, on the other BMW models or oven other marque forums - our crowd is more helpful...

And again, it is your ride, you can paint it pink-green, lower the back on 10" rims and raise the front on 24" rims - whatever tickles your pickle!!!

You will always get somebody who will be in love it, and somebody who will hate it... that is the nature of modding...

I personally keep my car lowered when parked (access mode), and let it come to standard height once it starts moving - if you are looking for the factory values, i have posted somewhere the values in mm, just need to do a search...

I may suggest programming your fogs together with high beams, the bi-xenons with high beams (safety is in well lit road), deleting the yellow lights iin the front corners, getting a silver light bulb for the rear turn signals to get rid of the yolk there... cheap, easy mods...