This is my first semi-classic car review.
Many cars in NZ are modified, so they become 'boy-racer' cars. These automotive atrocities are usually just 17 year old Nissan Skylines and Subarus, with ridiculous body kits, spoilers, 157 decibel stereos, and garish paint jobs. These cars are the primary transport of choice for the party-pill eating, cap-wearing yobs, who communicate in a new language involving words such as 'yo', and 'sup'. So far this review has nothing to with the BMW 525i; but I haven't mentioned the other feature of these boy-racer cars.
Many young drivers (including me, I must confess) want their car to stand out from the crowd. The first thing that many boy-racers do to their cars, is bypass the muffler system in the exhaust. In nearly all of these cars, the muffler is so unused, that colonies of moths and other insects can safely live in it without fear of hot, fast moving exhaust gases charging into their home.
The reason why the muffler is bypassed, is to make the car loud. Very loud. Many residents living in prime boy-racer territory complain about the terrible noise. And the reason why the noise is so awful, is that the original source of this noise (usually a boring 4 cylinder engine) is unchanged. You can't use a muffler-less exhaust system to improve on a terrible din.