The aftermarket muffler route is a great way to go if you don't mind the constant feeling like your head is about to explode from the resonance. I couldn't take it.
My modification opened up holes that were about 1-1.5" deep and occupied about half the circumference of the inside of the muffler inlet pipe. That acheived, for me, a perfect balance of sound with zero resonance. With no ungainly external pipes.
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