[dsraven]

Personally I always try to exit the exhaust at the rear because there are noxious fumes plus corrosive that are in the exhaust. Not to mention the black crap that likes to stick to your paintwork. If exiting out of some bodywork part then think really about some sort of flex for the piping because the body doesnt flex like the exhaust does. A lot of newer vehicles have a flex joint somewhere close to the front to allow the engine to move under torque without affecting the whole exhaust system so it bangs around against stuff.