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 - Stoptech
01 525iT - TiAg - Koni - B&G
04 Chevy Suburban - SLP - BlackBear - Belltech
01 330Ci - parts car
16 Chevy Tahoe - Wife's Daily