Soundproofing removed on mine after fitting mountune’s induction kit, was concerned about the extra heat on the underside of the bonnet and found this company https://www.nkgroup.co.uk/product/car-underbonnet-kit/ , really good product and easy to fit, they make a Focus kit, also got their engine blankets for track days etc when the engine is under extra load.
fitted the SCC as mine whistled terribly, once fitted whistling went.