I don't know if BMW has tighter parameters but I do know from personal experience that the non fouler trick worked perfectly for me on a 2001 Gmc Jimmy. It has been installed for almost a year and the light never came back on and the cat was completely gutted out.
Originally Posted by ac_2007
Read the past few pages of this thread. The spark plugs defouler mod has already been debunked.
It DOESN'T work.
01 325iT ZSP - Koni - Hotchkis
01 525iT - TiAg - sport susp - stock for now
04 Chevy Suburban - Modded - My Daily
08 Chevy Suburban - Modded - Wife's Daily