So far I installed a foam filter, and took a saw to the bottom of my stock airbox (I should have waited to have done this but too late now), and last night I installed a Woosh crossover pipe. Man it sounds great! I have a Mountune silicone induction hose on order so ill install that once it arrives. Its loud enough when I get on it and still pretty quiet when I am cruising around.
https://whoosh-motorsports.myshopif...er-pipe-kit-2014-2019-fiesta-st-free-shipping