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Nice car!! I have a 2006 Z4 M and want to get nitrous installed. Just a couple of questions........Do you have to retard the timing when you run your nitrous? if so...how? can you run that 75 shot with 93 octane? How is your nitrous running now? How well can you go from 0 to 60 with nitrous?? thanks man..sorry for all the questions. That's cool your juicing the Z4 m