They should just get rid of the whole emissions system all together and be done with it.
This should be BMW's response to any hippy complaining.
Mods: BPC tune, AEM Meth Injection, BDP downpipe, Wagner intercooler, Bilstien B12 Kit, M3 Control Arms, MB Quartz Kit/Alpine Amp
Best 1/4mi Trap: 111.86
Best 1/4mi Time: 12.54