1. when you feel like something new
2. when it rots and falls off, which wont happen unless it's wrapped.

 

When your neighbors stop complaining!

 

Just when you were thinking about asking this question? You already thought about changing them.

 

It was not my exhaust that failed, but rather the muffler breaings, see some yo-yo at the plant forgot to lube them, they held up for about 600 miles and when the muffler bearings went out it was cheaper to replace the whole exhaust, or so I thats how I explained it to the old lady...lol

 

?????????????????? Serious

 

10 feet or 10 seconds, which ever comes first or when ya get the money... but watch out for turn signal fluid leaks, that willsieze a muffler bearing and rust a muffler bolt instantly!