Originally Posted by bobs

Just a little FYI, the knee bolster is there to keep you positioned properly for a potential airbag deployment in the event of a crash. US-spec cars are required to be able to restrain an un-belted adult in the event of a collision. The knee bolster was probably the only way they could prevent the crash test dummies from sliding under the steering wheel and getting their heads blown off by the airbag. So, if you regularly drive without your seat belt fastened it might be a good idea to leave the bolster where it is.