I was planning on installing the Megan race headers and deleting the cat on my 04 mini R53. I was just curious to know is there anyway to be able to do that but not have my CEL on? I have a leak in my cat now and the light is on that's why I was planning on doing this

 

Some good information in this NAM thread here. See if it may be helpful to you.

 

I am catless, I had the spacer from outmotoring and it worked well for a month, I have a CEL now, but its not the catalyst inefficiency. its bank 1 sensor found a lean. forget the code number off my head. but im not sure im getting that cause im catless, I think I may just have a leak somewhere in my header.


being catless is great, you have a wonderful smell that follows you, I basically have gunshots with the right pop and burble, and sounds great!

 

Ya I'm having the same. Problem I'm gonna replace the header gasket and hope the p0206 lean bank 1 code goes away. It's really annoying... Am I actually lean or just have a leak.

 

been running catless for 5 + months and started with new O2 sensors and now consistently getting that code , at a point i think i got a leak somewhere too i think

 

Yep same here. I have a full milltek exhaust headers as well. No cat and keep getting the bank 1 lean, stuck lean code. Super annoying. Am I actually lean or do I have a leak. I'll be installing a new header gasket tomorrow and let you know. Is there a tune delete for going catless??? I might have to re-install the cat but the car hates it. I just don't want to actually run leannif I really am with 38lb injectors and a 16%supercharger pulley and Alta intake. I don't think I should be.

 

Any updates on this? I have a 2004 mcs with 100k and have this code. Im assuming its just the cat, but I would love to go catless, but would even more like to have this annoying code go away.