Why not a muffler delete? From the videos I've watched, it sounds like a nice bump in volume without the rasp you get from a resonator delete. Since you have your 135i muffler bolted on, just take it off and drive around for a day or two and see if that's what you like. If it is, buy a Berk or have a shop fab up a pipe with tip.
I'm in the same boat as you. I have the 135i muffler and once I can find some time, I plan to do a muffler delete to get more volume. If it's too loud I'll just put the 135i muffler back on.
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