Wow - I'm not sure what the musical term may be, but youngsters here refer to that sound as "doof".

Around here the teenagers refer to making those artificial earthquakes as "bumping." Although I find it to be gosh-awful annoying, I must confess to having been young once. Back in the 1960s I had an old Renault 4CV with a highly modified engine. When I could get away with it I would remove the muffler and install a 38" pipe with an 18" megaphone attatched. The yowl of that little engine at 8,000rpm was music to my severely overtaxed ears!

There's an article in the latest Popular Mechanics magazine about the correlation between automobile exhaust sounds and the driver's mental state. The Flowmaster muffler company is doing research on tuning mufflers to the emotions of a car's intended market. If only Orwell could see us now!