I've seen performance exhaust pipes on sale for cars and motorcycles, and my questions are these: What does it do? (mechanics.stackexchange.com)
The causes of truck accidents are similar to those of car and motorcycle accidents, but the outcome of truck crashes is often even more serious. (craigswapp.com)
Oh, and 29 died in car and motorcycle accidents not involving pedestrians or cyclists. (treehugger.com)