Pick my mufflers

I replaced my Flowaster rattle dronathons with Borlas Pro Xs. They definitely fill the bill for the deep exhaust note. I've got 2-1/2 with an x-pipe all the way out the back and I like the sound better than anything else I've heard so far. I think they have the deepest note of any. I've got the car torn apart right now or I'd video you a sound sample.
A friend has a Mustang that had Borlas on it when he got it. He has spent a fortune on muffler changes trying to find the "coolest sound". He must have had ten different mufflers sets on it in two years. He's currently back to the original Borlas and believes they are the ones he's staying with. The only others (in my opinion) that had close to a similar depth of tone were some Hooker mufflers, maybe the Aerochambers, not sure. I decided on the Borlas to replace my Flowmasters after hearing about 8 or 9 of his trys at improving what he started with. His Borlas have a bit of a rasp in higher RPM but I don't notice that in my car. I got my Borlas from a website called Wicked Nickys for a good price.