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If you're looking for some indication on how long the exhaust system may last, I'll offer up some hints. Firstly, as they say, your mileage may vary. Drive more highway miles each day and your system will laaaaassst! I drove my 2001 Elantra over 200k miles with the original exhaust system and NEVER had a problem. But, there were lots of highway miles in that 200k. If, on the other hand, you drive more city or stop and go miles, then you'll probably experience a shorter lifespan.
100% accurate. Worked with a guy that lived about 1/2 from the plant front door. Started the truck, drove it 1/2 to work, 1/2 mile home. Condensation build-up inside the muffler. The exhaust system never got hot enough to burn off the inside of the system. Consequently, he was going thru mufflers every 18 months.
 

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Back in the 60's and 70's the exhaust pipes needed to be religiously replaced every 18-24 months. Things got a lot better in a hurry, By the end of the 80's pipes lasted the life of the car. 10 years+ and 100,000miles+ was easily accomplished. Since then I have never replaced any exhaust. I think the last car I had that needed exhaust pipes was a '84 LeBaron.

409 SS has 1/2 the thermal expansion rate of 304SS which makes it ideal for high temp operation. It is THE most popular grade of stainless steel for exhuast systems and furnace operations. 304 is nice for pretty things that don't have to work too hard. Sort of the difference between Mary Ann and Ginger. (some of you may not get that last reference)
 

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Modern exhaust systems are made with stainless anodized powder-coated unobtanium.
LOL!!! I just watched that movie again last night. ^_^ Still get a kick out of the name "unobtanium".


I would disagree.
The pipes may last, sure. But the lining/walls in the muffler might not. Even if there are no leaks the exhaust becomes loud.
If you start burning oil, you'll probably replace the cat before the muffler.
 
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