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I personally did my PE mod by leaving all the insulation in and really it sounds so smooth and professional. Never ever any rasp or drone and it is loud enough, if this is what you are scared about.
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TOTALED  | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport
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