Introduction To Roth Automotive Science › Forums › Engine › Reason for Pre-cats Tagged: catalytic converter, emissions This topic has 0 replies, 1 voice, and was last updated 1 week, 3 days ago by admin. Viewing 1 post (of 1 total) Author Posts January 19, 2025 at 10:33 am #646 adminKeymaster Why Pre-Cats (Close-coupled Catalytic Converters) Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In