Hey guys so pretty much im just curious in how long HFC will last and be functional until the CEL light comes on...miles wise would be awesome cause time wise depending on how much ppl drive. Thinking of getting some HFC as my next mod

 

I personally havent seen aftermarket HFC's last as long as the stock cats,maybe about half the life.
I would just go with test pipes instead,i went with Kinetix HFC's at first and wasnt very happy with them so i did resonated test pipes and i like them much better.