So I installed this muffler on a Jeep XJ with a 4.0 liter engine and I live in a rust belt so lots of salt and calcium are bad conditions for silencer. Also, I carry a lot. I installed it last July 2020 and just had to cut it out in March 2021 due to a few cracks/holes so it will last about 8-12 months in really really harsh conditions (constant heavy throttling, dull high exhaust temp and salt + calcium)