Exhaust Drone From Straight Pipes

sopwith21

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Newbie here. Just got an '03 Z4. The previous owner has deleted everything from the cats back, so now I have straight pipes.
1) It sounds great.
2) Except for the drone at 3500 rpm's. Totally undrivable on the interstate.

Now what? I'm considering the following, in this order:
1) Helmholtz resonator
2) Flo Pro Twister Race Resonator
3) Glass packs

The Most Important Thing To Me is... I love the "popcorn" sound when I let off the gas. Just sounds amazing. I hope whatever I do to silence the drone does not kill the popcorn sound. That's the big problem.

What option will preserve the popcorn sound yet eliminate the droning? Thank you!
 

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