View Single Post
      02-15-2012, 05:52 PM   #25
Drives: 2009 AW M3 DCT
Join Date: May 2010
Location: NoVA

Posts: 631
iTrader: (0)

Some guys have gutted the secondary cat. Not much power to be gained but its free if you do it yourself or very cheap if a shop does it. Gutting the secondary cat has no effect on you passing smog, readiness, or leaving a bad smell (once the primaries are warmed up) as there is no sensor behind it unlike the primary cat.
2009 e92 M3 - AW DCT - Apex Arc8s - Corsa
Nautik is offline  
Reply With Quote