Z4M Decat

[Ricard]

Hi, I have a 2007 Z4M, it's a German spec car and I want to decat it. How can it be done successfully.

 

[mmm-five]

When you say 'successfully', do you mean so it stays legal/MOT-passable, or just so that it doesn't throw up error codes?

 

[Ricard]

Yes just so that it doesn't throw out warnings.

 

[Beedub]

the car will need a remap to turn off the rear post cat sensors. i run this setup on my car.

 

[Ricard]

Will mini cats work at all.

 

[Beedub]

you'll still get a CEL light with 100 Cell cats. i swap between the two. The car will need a remap disable the rear o2 sensors... They are still in placed and must be in place for the light to remain off, the rear 02s are narrow band and only checking for CAT efficiency , the Front 2 are wideband and feed back for fuel trims.

SS use 200 cell HJS cats and these apparently don't throw a CEL and tbh i think the S54 doesnt respond to decat as you'd hope unless Fi, even then it looses TQ but gives top end HP.