I don't think it really matters on nozzle location. I read on the instructions from SMC that if you have a Front Mount, you just put it on either side of the pipe, but I think he suggests putting it on the bottom for a stock location. Side works fine for my FM! 24# of boost, with either 1 or 2 knock counts with no retard. This has been the only "bolt on" that the wife asked how much it was and then said it was worth it!