View Single Post
      05-17-2018, 10:31 AM   #9
jpra923
Second Lieutenant
31
Rep
226
Posts

Drives: 2011 M3
Join Date: Feb 2017
Location: Seattle

iTrader: (0)

What performance benefits do you gain from using the stock cats? My understanding (which is limited) is that the biggest restriction in our exhaust system is the cats. So if you're looking for better performance wouldn't you want HFC's or just delete them and not reuse the old cats? Just curious. Thanks!
Appreciate 0