Ok - the Cobb Catback has been a bit noisy, so trying to mitigate the resonance in the cabin... Reading some of the http://focusst.org forums, one help is to do a sound symposer delete - it's an auditory tube that actually pipes exhaust noises into the cabin to give the car a racy sound (stock) - obviously with a catback, we've altered the sound quite a bit
CFM Performance 4-0300 Symposer Delete with Pressure Port for 2013-2016 Ford Focus ST is one of the most cost effective ones I've found... just ordered :)
Hopefully in a couple of days, we will have some difference of sound ;)
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