he means order of airflow: start with the intake, then header, s-pipe, and finally catback exhaust.
i personally always start with exhaust since thats what people see and its a hard choice to make (all the different styles make your head spin!), then intake, and finally the header/s-pipe.
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06 Flint Mica
~Current mods: Mod Express 6000k HID, TWM Performance shifter bushings, Eibach Sportline springs 
~ Waiting on: Tokico Blues, strut bars, TRD Sway bar, Enkei RPF1 Special Edition Black 
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