I have the ztube/pop combo and have recently been getting annoyed by the hissing while below half throttle. It never use to bother me but now that its summer I drive with my windows open all the time and its really noticeable.

It's not a whooshing sound, but a really bad hiss.

Anyone else have this issue? Is it normal? I've had after market short ram intakes on my other cars and dont recall it sounding this bad.

 

I have an Arc intake (airbox and tube), it whistles really loudly at 2500-3000rpm. I love it. Too bad the sound is costing me like 10-15whp in hot weather.

If you don't like the sound, then just go back to the stock airbox. You get quieter sound with no whistling AND no heat soak issues.

 

It's bothering me because I thought it was an unnatural sound. But if it's normal.. then hell.. I'll dance to that tune all day.