I've got a 40 series delta flow on mine. $136 installed with an SS tip at the local muffler shop. At idle it has a nice deep rumble that you can't really hear when sitting in the car. Through acceleration it has a nice tone to it, NOT ricer sounding. As you move through the RPM's you begin to hear more and more engine noise... I'd say past 3500 and you really mostly hear intake. At about 3000 RPMs it's got a slight drone, but turn the radio on and it's gone. When you let off the accelerator you get that nice deep "bubbly" sound.
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