Originally Posted by Venom
If you guys haven't found a catless solution. Try Wagner's N55 high-flow catted downpipe. He guarantees no CELs and the workmanship is quite impressive. I got to check out a model today and was thoroughly impressed. http://www.wagner-tuning.com/BMW-135...gine_p_64.html
I'm very interested to see back to back dyno results with this Wagner piece and a cat less version. If the difference isn't too great this would be a great solution.