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The resonance in 6th gear at cruise is minimal. I'd say about 10% louder than stock. Playing the radio at moderate levels will drown it out. As far as the two vs four cans is concerned, I like the two big tips. My Z burns some oil and I find the rear fascia doesn't get nearly as dirty now because the tips stick out a little farther than the stockers did.
Some call it resonance, I call it soothing music. :yesnod:
I agree with mmorse, its very minimal at highway cruising speed. No problem at all. I usually have the tunes on when cruising in 6th anyway, so I don't notice it at all.
And if that is the only downside? :rolleyes:
It is by far the BEST sounding system on the market today. I'd pay double for it if I had to. :cheers: