Originally Posted by HeavyMetalRocker
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.
I need a new hobby and by your screen name I assume you like noise and loud ones!