I remember having this discussion with Frank Krygowski ages ago...
probably about 10 years ago I lived in a neighborhood where the only way
in or out involved going over two speed bumps (yes, on public roads -
this was not a gated community, it was just one of those neighborhoods
that was designed so that there's only one way in or out. I don't like
that either, but it's disturbingly common in this area and hard to
avoid.) They were literally taller than the clearance that I had
between the resonator and the ground on my then-DD VW Scirocco. After
scraping four times a day for several months, my exhaust fell apart at
one of the welds of the resonator (shocker!) so I had a local shop weld
in a straight pipe in place of the resonator. My neighbors probably
loved it, but fuck 'em, they were probably the same assholes that
lobbied for the speed bumps in the first place.
My current vehicles are a Jeep Cherokee and a BMW 3-series coupe; the
former obviously has no problem at all but in the latter, there are a
couple local speed bumps that I will go out of my way to avoid after
nearly biting my tongue off dropping the chassis onto one of them.
Fortunately there was no damage to the vehicle that I could discern. I
am a little annoyed at those wacky Krauts though as I do consider the
vehicle excessively difficult to get underneath (to the point where I'm
going to have to buy a new floor jack at some point, as my current one
will not fit under the car without driving the car on some 2x6s first)
but the fact remains that it's stock (does have M-sport suspension
option) and unmodified (in fact, my winter tires are 225/50-17 rather
than the factory recommended 225/45-17 so I actually am sitting a little
taller than the factory intended ATM,) and there's scads of them on the
roads around here (along with various Porsches, Maseratii, etc. which
have similar ground clearance.)
I can't find a spec in the owner's manual but it appears that the ground
clearance of an '09 E92 coupe is about 4.5" or so.