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I have an HPF on my 07 e90 and it's truly unlike any exhaust for the 335i. the only exhausts I've found it comparable to sound wise are the exhaust systems for the 1m. PS, if you aren't okay with some drone then I suggest you find a new hobby.
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 2007 335i e90 6mt | Motiv 750 XR8267 | RB PCV | JB4 G5 | MHD Pump Flash | Walbro 255lph | VRSF CP & Tial BOV | NGK Plugs | Custom Side Exhaust | CxRacing FMIC | Spec 2+ & SSMFW | StopTech Drilled/Slotted Rotors | Hawk Performance Pads | DEFIV Lockdown kit | Mtec V3 | Apex PS7s | 35/15% Llumar ceramic  |