This is another one of those 'it depends' answers. If you drive the car enough distance so that the exhaust system is regularly warmed though and can evaporate any water within it, then it will last longer, I'd estimate 3-4 years. If the exhaust is regularly driven short distances, it will will contain some water, which will corrode the exhaust over time. Driving on salty roads will also have a marked detrimental effect.GregF said:Well then, how long with the stock exhaust last? And more importantly, over time will the stock exhaust note improve (i.e.; deeper, throatier)?