Airtec Stage 3 500+ bhp Airtec Intercooler 100mm core, Flowed end tanks + ScoopAirtec stage 3 is the only off the shelf intercooler that uses a 100mm deep core! we use this core only in the most extreme coolers, we name the 100mm core 'GobStopper' due to it's amazing cooling properties The Airtec stage 2 had already proved itself in the Focus RS tuning scene as the must have mod for 400+ cars, we wanted to take the stage 3 to a whole new level and it took well over 10 month's to get perfect.