scion xb exhaust system is usually tubing used to guide waste exhaust gasesaway from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of:An exhaust pipe must be carefully designed to carry toxic and/or noxious gases away from the users of the machine. Indoor generators and furnaces can quickly fill an enclosed space with carbon monoxide or other poisonous exhaust gases if they are not properly vented to the outdoors. Also, the gases from most types of machine are very hot; the xb pipe must be heat-resistant, and it must xb not pass through or near xb anything which can burn or can be damaged by heat. A chimneyserves as an exhaust pipe in a stationary structure xb.

• In many trucks / lorries all or most of the exhaust system is visible. xb Often in such trucks the silencer is surrounded by a perforated metal sheath to avoid people getting burnt touching the hot silencer. This sheath may be chrome platedas a display feature. Part of the pipe between the engine and the silencer is often flexible metal industrial ducting, as in the image in the section "Terminology". Sometimes a large diesel exhaust pipe is vertical, xb to blow the hot noxious gas well away from people; in such cases the xb end of the exhaust pipe often has a hinged metal flap to stop debris and birds and rainwater from falling inside. Sometimes this xb exhaust pipes have some flex connector attached with it. This helps in minimising the xb vibration from the engine to be transferred into the exhaust system.With trucks, sometimes the silencer is crossways under the front of the cab and its tailpipe blows sideways to the offside (right in UK, left in USA looking from the back of the car). The side of a passenger car on which the exhaust exits beneath the rear bumper usually indicates the market for which the vehicle was  xb designed, i.e. Japanese (and some older British) vehicles have exhausts on the right so they are furthest from the curb in countries which drive on the left, while European vehicles have exhausts on the left xb.