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Originally Posted by M2SJ
Hi Chaps, I hope you can help with whats maybe a dumb question but I'm a newbie to the whole BMW tuning stuff.
I've seen all the benefits to fitting one of the Catless downpipes ie. better performance, sound etc. However I understand this is likely to throw CEL errors. I also understand that by installing the JB4 system that this will remove the CEL's as and when they are raised?
However, when I take my car to get serviced, I'd understandably want to remove the JB4 unit etc.. This would leave me with the downpipe and vulnerable to CEL issues on the way to the garage and during the service.
How do you guys avoid this or am I thinking too hard about something that will never happen.
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Without JB4 it will throw a catless code. Look into the Fabspeed catted downpipe if you don't want a code.
The O2 sensor fix didn't work for me. An alternative to all of this is to tell your SA or head tech that you want to go catless. Well not catless, just say your getting a downpipe for sound and that it will throw a code. A lot of them will ignore it and won't flag it. Ask before you do it, preferably during your next service while the tech is working on it. They like that stuff too.