It's so hard to tell thru vids, but it really seems like my Magnaflow 3" catback Competition series is louder, but it may be the camera mics. I have all else stock, but with the magnaflow when I start it in the garage & it idles, you can hear the car up stairs in the bedrooms, that's in a 7K SF house, things rattle on the shelves of the garage. Revving gives burbles and on acceleration I still hear the blower whine but barely, but the 11's have a baffle to quiete the whine that's still in mine, so you almost have to know to listen for it, but I'd think it's be "hearable" (lol) once the baffle is removed. I don't think I could go louder & still have it comfortable in teh car for cruising, the 2K rpm drone is pretty good, you can talk and hear the radio, but if it was just a little louder it would annoy passengers and you'd have to make extra effort in talking. Drive by is plenty loud, taking off down the street I get people turning around & looking from the sounds all the time. But the only way to really know what they sound like is to try to find someone's you can hear, otherwise it's a bit of a betting game. Good luck.

 

I am going through the same thing. First change was FRP axle back. It sounded better than stock. I wanted more so went to Low restriction Cats and X pipe with FRP mufflers. I have been happy, almost. Can still hear the SC, no drone. Only complaint, is that they sound rassby until they warm up. The bubble back is a little annoying. You Tube was no help. Don't want to drop $600 every time i want to try something.

 

I just wonder whether the KR's or the Stingers would drown out the supercharger more!