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I dont have an E93 but i do have an e92, Im running JB4 and DCI with a muffler delete.
Personally, i like the sound of the muffle delete and i doubt the 4" tips are going to add THAT much noise and as for drone, local commute there is no drone. When you get on the highway like razzle said the drone is really not that noticeable, windows down or up.
Go straight pipe it should sound pretty nice, and of course post a vid and some pics
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