Oldish guy, here. I did just about all the reading and comparisons one can do online and ended up with a Borla cat-back. Very satisfied. Grumbly and rumbly with no rasp, moderate volume increase without drawing attention unless you mean to. Tips are oversized but not to a grapefruit-holding amount.
It's only 2.5" inch, but I don't think that's a restriction until you're well into stage 3. (I'm a mild stage 3, ~280 HP at the wheels.)