[Richard L]

I was told by our customers, WI is no longer allowed from 2006. I did not look into this in any details, just accepted it.

I did write to FIA to unbanned it with almost all the benefits highlighted by the the current BMW blog. I never received any reply.

I attended and spoke out one of the official motorsport conferences called "Green Motorsport", no results on that either. During the conference I raised the topic of applying water injection on reducing nitrous emission on road cars but he dismissed the idea and assured me their FSI technology has taken care of this.

Currently, cars with 3-way cat (95%) uses nitrous trap, and purge them with occasional CO rich exhaust gas. If you are interested I will try digging out the article. They called it "Lean Nox Trap Regeneration", technical or simply "dumping fuel".