Back in April of last year when I purchased my one owner 1990 300SE with 62k miles on the clock, it still had its original Factory exhaust. It's a Southern Florida car and has been its whole life. The middle muffler had 1" diameter hole in it and the rear muffler was getting there. Since they lasted nearly 20 years it was a no-brainer to go with OEM replacements by Eberspacher.