I've read that you have to reflash if you get a CAI but not if you put a drop-in filter. Is this correct? Is the reason you have to reflash due to a new MAF? Could you use the stock MAF with a cone filter and different intake tubing instead of the stock air box and not need a reflash? Would you get any gain? The reason I ask is I already have the parts to do it now but no flash tuner.