When I was at the LR dealer a couple weeks ago, I happened to be standing behind a Jag XK when someone fired it up. I 'bout hit the floor, it sounded so good. It's the same engine as the RRS, but RRS sounds anemic by comparison. What's the best way to get that kind of throaty growl on the RRS? Anyone have thoughts on the sound of Borla vs. Magnaflow cat backs, or some of the others?