I have the Pro XS on mine SI/DO 19" and the drone in my cab is terrible. I've had it for a year and as soon as I get a break in bills I'm taking it off and going back to something quieter. I have 3 little ones and eventhough they have never said anything about it, it drives me nuts. When driving around town it sucks having to turn your radio up quite a bit because of the cab drone. Has a great sound when you step on it, but around 1800-2000 RPM it gives me a headache.

 

how do u think i feel with my dynomax bullet. at 2000 rpms its terrible. im getting some sound proofing material to install under the truck right above the muffler to help cut down the drone. hell i might even double it up!