The factory system has a VERY narrow gap between the intake tubes and the filter.....that, the filter type, flat Y to the SC and the total air path is what is so restrictive.....

The SL55 system is a bigger air box with bigger spacing between the filters and the intake, more open Y pipe feed and bigger intake tubes up front..... the SL55 system will be about the same as the Needswings single CAI....

I have had the factory, SL55 and NW Dual systems on my Aero.... the NW Dual is on it now and will stay there......